Bump version to 0.0.97

Relax lowercase condition in N806 (#562 )
Avoid autofixes for errors in f-strings (#561 )
2022-11-02 22:38:43 -04:00 · 2022-11-02 22:38:29 -04:00 · 2022-11-02 22:31:57 -04:00 · 2022-11-02 22:10:56 -04:00 · 2022-11-02 22:10:01 -04:00 · 2022-11-02 22:03:54 -04:00
289 changed files with 12735 additions and 3391 deletions
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -27,7 +27,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo build --release
+      - run: cargo build --all --release

  cargo_fmt:
    name: "cargo fmt"
@@ -36,7 +36,10 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
+          components: rustfmt
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -49,7 +52,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo fmt --check
+      - run: cargo fmt --all --check

  cargo_clippy:
    name: "cargo clippy"
@@ -58,7 +61,10 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
+          components: clippy
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -71,7 +77,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo clippy -- -D warnings
+      - run: cargo clippy --all -- -D warnings

  cargo_test:
    name: "cargo test"
@@ -80,7 +86,9 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -93,7 +101,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo test
+      - run: cargo test --all

  maturin_build:
    name: "maturin build"
@@ -102,7 +110,9 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
      - uses: actions/setup-python@v4
        with:
          python-version: "3.10"
--- a/.github/workflows/flake8-to-ruff.yaml
+++ b/.github/workflows/flake8-to-ruff.yaml
@@ -0,0 +1,298 @@
+name: "[flake8-to-ruff] Release"
+
+on: workflow_dispatch
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  PACKAGE_NAME: flake8-to-ruff
+  CRATE_NAME: flake8_to_ruff
+  PYTHON_VERSION: "3.7" # to build abi3 wheels
+
+jobs:
+  macos-x86_64:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          default: true
+      - name: Build wheels - x86_64
+        uses: messense/maturin-action@v1
+        with:
+          target: x86_64
+          args: --release --out dist --sdist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel - x86_64
+        run: |
+          pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+  macos-universal:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          default: true
+      - name: Build wheels - universal2
+        uses: messense/maturin-action@v1
+        with:
+          args: --release --universal2 --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel - universal2
+        run: |
+          pip install dist/${{ env.CRATE_NAME }}-*universal2.whl --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  windows:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        target: [x64, x86]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: ${{ matrix.target }}
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          default: true
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          args: --release --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel
+        shell: bash
+        run: |
+          python -m pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [x86_64, i686]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: auto
+          args: --release --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel
+        if: matrix.target == 'x86_64'
+        run: |
+          pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  linux-cross:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [aarch64, armv7, s390x, ppc64le, ppc64]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: auto
+          args: --no-default-features --release --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - uses: uraimo/run-on-arch-action@v2.0.5
+        if: matrix.target != 'ppc64'
+        name: Install built wheel
+        with:
+          arch: ${{ matrix.target }}
+          distro: ubuntu20.04
+          githubToken: ${{ github.token }}
+          install: |
+            apt-get update
+            apt-get install -y --no-install-recommends python3 python3-pip
+            pip3 install -U pip
+          run: |
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  musllinux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - x86_64-unknown-linux-musl
+          - i686-unknown-linux-musl
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel
+        if: matrix.target == 'x86_64-unknown-linux-musl'
+        uses: addnab/docker-run-action@v3
+        with:
+          image: alpine:latest
+          options: -v ${{ github.workspace }}:/io -w /io
+          run: |
+            apk add py3-pip
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links /io/dist/ --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  musllinux-cross:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform:
+          - target: aarch64-unknown-linux-musl
+            arch: aarch64
+          - target: armv7-unknown-linux-musleabihf
+            arch: armv7
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          target: ${{ matrix.platform.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - uses: uraimo/run-on-arch-action@master
+        name: Install built wheel
+        with:
+          arch: ${{ matrix.platform.arch }}
+          distro: alpine_latest
+          githubToken: ${{ github.token }}
+          install: |
+            apk add py3-pip
+          run: |
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  pypy:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        target: [x86_64, aarch64]
+        python-version:
+          - "3.7"
+          - "3.8"
+          - "3.9"
+        exclude:
+          - os: macos-latest
+            target: aarch64
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: pypy${{ matrix.python-version }}
+      - name: Build wheels
+        uses: messense/maturin-action@v1
+        with:
+          maturin-version: "v0.13.0"
+          target: ${{ matrix.target }}
+          manylinux: auto
+          args: --release --out dist -i pypy${{ matrix.python-version }} -m ./crates/${{ env.CRATE_NAME }}/Cargo.toml
+      - name: Install built wheel
+        if: matrix.target == 'x86_64'
+        run: |
+          pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
+      - name: Upload wheels
+        uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: dist
+
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    needs:
+      - macos-universal
+      - macos-x86_64
+      - windows
+      - linux
+      - linux-cross
+      - musllinux
+      - musllinux-cross
+      - pypy
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: wheels
+      - uses: actions/setup-python@v4
+      - name: Publish to PyPi
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.FLAKE8_TO_RUFF_TOKEN }}
+        run: |
+          pip install --upgrade twine
+          twine upload --skip-existing *
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -1,8 +1,6 @@
-name: Release
+name: "[ruff] Release"

 on:
-  pull_request:
-    branches: [main]
  create:
    tags:
      - v*
@@ -297,7 +295,7 @@ jobs:
      - name: Publish to PyPi
        env:
          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+          TWINE_PASSWORD: ${{ secrets.RUFF_TOKEN }}
        run: |
          pip install --upgrade twine
          twine upload --skip-existing *
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,8 +1,8 @@
 repos:
  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.40
+    rev: v0.0.97
    hooks:
-      - id: lint
+      - id: ruff

  - repo: https://github.com/abravalheri/validate-pyproject
    rev: v0.10.1
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,12 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "anes"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
+
 [[package]]
 name = "annotate-snippets"
 version = "0.6.1"
@@ -368,6 +374,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c1db59621ec70f09c5e9b597b220c7a2b43611f4710dc03ceb8748637775692c"

+[[package]]
+name = "cast"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
+
 [[package]]
 name = "cc"
 version = "1.0.73"
@@ -416,6 +428,45 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"

+[[package]]
+name = "ciborium"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c137568cc60b904a7724001b35ce2630fd00d5d84805fbb608ab89509d788f"
+dependencies = [
+ "ciborium-io",
+ "ciborium-ll",
+ "serde",
+]
+
+[[package]]
+name = "ciborium-io"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346de753af073cc87b52b2083a506b38ac176a44cfb05497b622e27be899b369"
+
+[[package]]
+name = "ciborium-ll"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "213030a2b5a4e0c0892b6652260cf6ccac84827b83a85a534e178e3906c4cf1b"
+dependencies = [
+ "ciborium-io",
+ "half",
+]
+
+[[package]]
+name = "clap"
+version = "3.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71655c45cb9845d3270c9d6df84ebe72b4dad3c2ba3f7023ad47c144e4e473a5"
+dependencies = [
+ "bitflags",
+ "clap_lex 0.2.4",
+ "indexmap",
+ "textwrap 0.16.0",
+]
+
 [[package]]
 name = "clap"
 version = "4.0.15"
@@ -425,7 +476,7 @@ dependencies = [
 "atty",
 "bitflags",
 "clap_derive",
- "clap_lex",
+ "clap_lex 0.3.0",
 "once_cell",
 "strsim",
 "termcolor",
@@ -444,6 +495,15 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "clap_lex"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
+dependencies = [
+ "os_str_bytes",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.3.0"
@@ -466,6 +526,15 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "codegen"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff61280aed771c3070e7dcc9e050c66f1eb1e3b96431ba66f9f74641d02fc41d"
+dependencies = [
+ "indexmap",
+]
+
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -502,6 +571,12 @@ dependencies = [
 "cache-padded",
 ]

+[[package]]
+name = "configparser"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5458d9d1a587efaf5091602c59d299696a3877a439c8f6d461a2d3cce11df87a"
+
 [[package]]
 name = "console"
 version = "0.15.2"
@@ -539,6 +614,42 @@ dependencies = [
 "cfg-if 1.0.0",
 ]

+[[package]]
+name = "criterion"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7c76e09c1aae2bc52b3d2f29e13c6572553b30c4aa1b8a49fd70de6412654cb"
+dependencies = [
+ "anes",
+ "atty",
+ "cast",
+ "ciborium",
+ "clap 3.2.23",
+ "criterion-plot",
+ "itertools",
+ "lazy_static",
+ "num-traits",
+ "oorandom",
+ "plotters",
+ "rayon",
+ "regex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "tinytemplate",
+ "walkdir",
+]
+
+[[package]]
+name = "criterion-plot"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b50826342786a51a89e2da3a28f1c32b06e387201bc2d19791f622c673706b1"
+dependencies = [
+ "cast",
+ "itertools",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.6"
@@ -807,6 +918,21 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"

+[[package]]
+name = "flake8-to-ruff"
+version = "0.0.97-dev.0"
+dependencies = [
+ "anyhow",
+ "clap 4.0.15",
+ "configparser",
+ "once_cell",
+ "regex",
+ "ruff",
+ "serde",
+ "serde_json",
+ "toml",
+]
+
 [[package]]
 name = "flate2"
 version = "1.0.24"
@@ -1032,6 +1158,12 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "half"
+version = "1.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -1562,6 +1694,12 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e82dad04139b71a90c080c8463fe0dc7902db5192d939bd0950f074d014339e1"

+[[package]]
+name = "oorandom"
+version = "11.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
+
 [[package]]
 name = "opaque-debug"
 version = "0.2.3"
@@ -1770,6 +1908,34 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"

+[[package]]
+name = "plotters"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2538b639e642295546c50fcd545198c9d64ee2a38620a628724a3b266d5fbf97"
+dependencies = [
+ "num-traits",
+ "plotters-backend",
+ "plotters-svg",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "plotters-backend"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "193228616381fecdc1224c62e96946dfbc73ff4384fba576e052ff8c1bea8142"
+
+[[package]]
+name = "plotters-svg"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9a81d2759aae1dae668f783c308bc5c8ebd191ff4184aaa1b37f65a6ae5a56f"
+dependencies = [
+ "plotters-backend",
+]
+
 [[package]]
 name = "polling"
 version = "2.3.0"
@@ -2045,17 +2211,19 @@ dependencies = [

 [[package]]
 name = "ruff"
-version = "0.0.85"
+version = "0.0.97"
 dependencies = [
 "anyhow",
 "assert_cmd",
 "bincode",
 "cacache",
 "chrono",
- "clap",
+ "clap 4.0.15",
 "clearscreen",
+ "codegen",
 "colored",
 "common-path",
+ "criterion",
 "dirs 4.0.0",
 "fern",
 "filetime",
@@ -2079,7 +2247,7 @@ dependencies = [
 "strum",
 "strum_macros",
 "test-case",
- "textwrap",
+ "textwrap 0.15.1",
 "titlecase",
 "toml",
 "update-informer",
@@ -2101,7 +2269,7 @@ dependencies = [
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "num-bigint",
 "rustpython-common",
@@ -2111,7 +2279,7 @@ dependencies = [
 [[package]]
 name = "rustpython-common"
 version = "0.0.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "ascii",
 "cfg-if 1.0.0",
@@ -2134,7 +2302,7 @@ dependencies = [
 [[package]]
 name = "rustpython-compiler-core"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "bincode",
 "bitflags",
@@ -2151,7 +2319,7 @@ dependencies = [
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "ahash",
 "anyhow",
@@ -2539,6 +2707,12 @@ dependencies = [
 "unicode-width",
 ]

+[[package]]
+name = "textwrap"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
+
 [[package]]
 name = "thiserror"
 version = "1.0.37"
@@ -2579,6 +2753,16 @@ dependencies = [
 "crunchy",
 ]

+[[package]]
+name = "tinytemplate"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4d6b5f19ff7664e8c98d03e2139cb510db9b0a60b55f8e8709b689d939b6bc"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,11 @@
+[workspace]
+members = [
+  "crates/flake8_to_ruff",
+]
+
 [package]
 name = "ruff"
-version = "0.0.85"
+version = "0.0.97"
 edition = "2021"

 [lib]
@@ -26,9 +31,9 @@ once_cell = { version = "1.13.1" }
 path-absolutize = { version = "3.0.14", features = ["once_cell_cache", "use_unix_paths_on_wasm"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
-rustpython-common = { git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
+rustpython-ast = { features = ["unparse"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-common = { git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 strum = { version = "0.24.1", features = ["strum_macros"] }
@@ -50,6 +55,8 @@ getrandom = { version = "0.2.7", features = ["js"] }

 [dev-dependencies]
 assert_cmd = { version = "2.0.4" }
+codegen = { version = "0.2.0" }
+criterion = { version = "0.4.0" }
 insta = { version = "1.19.1", features = ["yaml"] }
 test-case = { version = "2.2.2" }

@@ -68,3 +75,7 @@ opt-level = 3

 [profile.dev.package.similar]
 opt-level = 3
+
+[[bench]]
+name = "source_code_locator"
+harness = false
--- a/README.md
+++ b/README.md
@@ -38,13 +38,25 @@ Read the [launch blog post](https://notes.crmarsh.com/python-tooling-could-be-mu
 1. [Installation and Usage](#installation-and-usage)
 2. [Configuration](#configuration)
 3. [Supported Rules](#supported-rules)
-4. [Editor Integrations](#editor-integrations)
-5. [FAQ](#faq)
-6. [Development](#development)
-7. [Releases](#releases)
-8. [Benchmarks](#benchmarks)
-9. [License](#license)
-10. [Contributing](#contributing)
+   1. [Pyflakes](#pyflakes)
+   2. [pycodestyle (error)](#pycodestyle-error)
+   3. [pycodestyle (warning)](#pycodestyle-warning)
+   4. [pydocstyle](#pydocstyle)
+   5. [pyupgrade](#pyupgrade)
+   6. [pep8-naming](#pep8-naming)
+   7. [flake8-comprehensions](#flake8-comprehensions)
+   8. [flake8-bugbear](#flake8-bugbear)
+   9. [flake8-builtins](#flake8-builtins)
+   10. [flake8-print](#flake8-print)
+   11. [flake8-quotes](#flake8-quotes)
+   12. [Meta rules](#meta-rules)
+5. [Editor Integrations](#editor-integrations)
+6. [FAQ](#faq)
+7. [Development](#development)
+8. [Releases](#releases)
+9. [Benchmarks](#benchmarks)
+10. [License](#license)
+11. [Contributing](#contributing)

 ## Installation and Usage

@@ -77,11 +89,14 @@ Ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.85
+    rev: v0.0.97
    hooks:
-      - id: lint
+      - id: ruff
 ```

+<!-- TODO(charlie): Remove this message a few versions after v0.0.86. -->
+_Note: prior to `v0.0.86`, `ruff-pre-commit` used `lint` (rather than `ruff`) as the hook ID._
+
 ## Configuration

 Ruff is configurable both via `pyproject.toml` and the command line.
@@ -91,13 +106,22 @@ For example, you could configure Ruff to only enforce a subset of rules with:
 ```toml
 [tool.ruff]
 line-length = 88
-select = [
-    "F401",
-    "F403",
-]
+select = ["E", "F"]
+ignore = ["E501"]
+per-file-ignores = {"__init__.py" = ["F401"], "path/to/file.py" = ["F401"]}
 ```

-Alternatively, on the command-line:
+Plugin configurations should be expressed as subsections, e.g.:
+
+```toml
+[tool.ruff]
+line-length = 88
+
+[tool.ruff.flake8-quotes]
+docstring-quotes = "double"
+```
+
+Alternatively, common configuration settings can be provided via the command-line:

 ```shell
 ruff path/to/code/ --select F401 --select F403
@@ -219,8 +243,7 @@ add `noqa` directives to all failing lines, with the appropriate error codes.**

 ## Supported Rules

-By default, Ruff enables all `E`, `W`, and `F` error codes, which correspond to those built-in to
-Flake8.
+By default, Ruff enables all `E` and `F` error codes, which correspond to those built-in to Flake8.

 The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` command-line option.

@@ -246,7 +269,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | F634 | IfTuple | If test is a tuple, which is always `True` |  |
 | F701 | BreakOutsideLoop | `break` outside loop |  |
 | F702 | ContinueOutsideLoop | `continue` not properly in loop |  |
-| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function/method |  |
+| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function |  |
 | F706 | ReturnOutsideFunction | `return` statement outside of a function/method |  |
 | F707 | DefaultExceptNotLast | An `except:` block as not the last exception handler |  |
 | F722 | ForwardAnnotationSyntaxError | Syntax error in forward annotation: `...` |  |
@@ -315,7 +338,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | D400 | EndsInPeriod | First line should end with a period |  |
 | D402 | NoSignature | First line should not be the function's signature |  |
 | D403 | FirstLineCapitalized | First word of the first line should be properly capitalized |  |
-| D404 | NoThisPrefix | First word of the docstring should not be `This` |  |
+| D404 | NoThisPrefix | First word of the docstring should not be 'This' |  |
 | D405 | CapitalizeSectionName | Section name should be properly capitalized ("returns") | 🛠 |
 | D406 | NewLineAfterSectionName | Section name should end with a newline ("Returns") | 🛠 |
 | D407 | DashedUnderlineAfterSection | Missing dashed underline after section ("Returns") | 🛠 |
@@ -329,7 +352,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | D415 | EndsInPunctuation | First line should end with a period, question mark, or exclamation point |  |
 | D416 | SectionNameEndsInColon | Section name should end with a colon ("Returns") | 🛠 |
 | D417 | DocumentAllArguments | Missing argument descriptions in the docstring: `x`, `y` |  |
-| D418 | SkipDocstring | Function decorated with @overload shouldn't contain a docstring |  |
+| D418 | SkipDocstring | Function decorated with `@overload` shouldn't contain a docstring |  |
 | D419 | NonEmpty | Docstring is empty |  |

 ### pyupgrade
@@ -354,32 +377,36 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | N803 | InvalidArgumentName | Argument name `...` should be lowercase |  |
 | N804 | InvalidFirstArgumentNameForClassMethod | First argument of a class method should be named `cls` |  |
 | N805 | InvalidFirstArgumentNameForMethod | First argument of a method should be named `self` |  |
+| N806 | NonLowercaseVariableInFunction | Variable `...` in function should be lowercase |  |
 | N807 | DunderFunctionName | Function name should not start and end with `__` |  |
 | N811 | ConstantImportedAsNonConstant | Constant `...` imported as non-constant `...` |  |
 | N812 | LowercaseImportedAsNonLowercase | Lowercase `...` imported as non-lowercase `...` |  |
 | N813 | CamelcaseImportedAsLowercase | Camelcase `...` imported as lowercase `...` |  |
 | N814 | CamelcaseImportedAsConstant | Camelcase `...` imported as constant `...` |  |
+| N815 | MixedCaseVariableInClassScope | Variable `mixedCase` in class scope should not be mixedCase |  |
+| N816 | MixedCaseVariableInGlobalScope | Variable `mixedCase` in global scope should not be mixedCase |  |
 | N817 | CamelcaseImportedAsAcronym | Camelcase `...` imported as acronym `...` |  |
+| N818 | ErrorSuffixOnExceptionName | Exception name `...` should be named with an Error suffix |  |

 ### flake8-comprehensions

 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
-| C400 | UnnecessaryGeneratorList | Unnecessary generator (rewrite as a `list` comprehension) |  |
-| C401 | UnnecessaryGeneratorSet | Unnecessary generator (rewrite as a `set` comprehension) |  |
-| C402 | UnnecessaryGeneratorDict | Unnecessary generator (rewrite as a `dict` comprehension) |  |
-| C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) |  |
+| C400 | UnnecessaryGeneratorList | Unnecessary generator (rewrite as a `list` comprehension) | 🛠 |
+| C401 | UnnecessaryGeneratorSet | Unnecessary generator (rewrite as a `set` comprehension) | 🛠 |
+| C402 | UnnecessaryGeneratorDict | Unnecessary generator (rewrite as a `dict` comprehension) | 🛠 |
+| C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) | 🛠 |
 | C404 | UnnecessaryListComprehensionDict | Unnecessary `list` comprehension (rewrite as a `dict` comprehension) |  |
-| C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) |  |
+| C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) | 🛠 |
 | C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) |  |
-| C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) |  |
-| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) |  |
-| C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) |  |
-| C411 | UnnecessaryListCall | Unnecessary `list` call (remove the outer call to `list()`) |  |
+| C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) | 🛠 |
+| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) | 🛠 |
+| C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) | 🛠 |
+| C411 | UnnecessaryListCall | Unnecessary `list` call (remove the outer call to `list()`) | 🛠 |
 | C413 | UnnecessaryCallAroundSorted | Unnecessary `(list\|reversed)` call around `sorted()` |  |
 | C414 | UnnecessaryDoubleCastOrProcess | Unnecessary `(list\|reversed\|set\|sorted\|tuple)` call within `(list\|set\|sorted\|tuple)()` |  |
 | C415 | UnnecessarySubscriptReversal | Unnecessary subscript reversal of iterable within `(reversed\|set\|sorted)()` |  |
-| C416 | UnnecessaryComprehension |  Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) |  |
+| C416 | UnnecessaryComprehension | Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) |  |
 | C417 | UnnecessaryMap | Unnecessary `map` usage (rewrite using a `(list\|set\|dict)` comprehension) |  |

 ### flake8-bugbear
@@ -387,8 +414,10 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | B002 | UnaryPrefixIncrement | Python does not support the unary prefix increment. |  |
+| B006 | MutableArgumentDefault | Do not use mutable data structures for argument defaults. |  |
 | B007 | UnusedLoopControlVariable | Loop control variable `i` not used within the loop body. | 🛠 |
 | B011 | DoNotAssertFalse | Do not `assert False` (`python -O` removes these calls), raise `AssertionError()` | 🛠 |
+| B013 | RedundantTupleInExceptionHandler | A length-one tuple literal is redundant. Write `except ValueError:` instead of `except (ValueError,):`. |  |
 | B014 | DuplicateHandlerException | Exception handler with duplicate exception: `ValueError` | 🛠 |
 | B017 | NoAssertRaisesException | `assertRaises(Exception):` should be considered evil. |  |
 | B025 | DuplicateTryBlockException | try-except block with duplicate exception `Exception` |  |
@@ -408,6 +437,15 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | T201 | PrintFound | `print` found | 🛠 |
 | T203 | PPrintFound | `pprint` found | 🛠 |

+### flake8-quotes
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| Q000 | BadQuotesInlineString | Single quotes found but double quotes preferred |  |
+| Q001 | BadQuotesMultilineString | Single quote multiline found but double quotes preferred |  |
+| Q002 | BadQuotesDocstring | Single quote docstring found but double quotes preferred |  |
+| Q003 | AvoidQuoteEscape | Change outer quotes to avoid escaping inner quotes |  |
+
 ### Meta rules

 | Code | Name | Message | Fix |
@@ -474,14 +512,16 @@ Ruff re-implements some of the most popular Flake8 plugins and related code qual
 including:

 - [`pydocstyle`](https://pypi.org/project/pydocstyle/)
+- [`pep8-naming`](https://pypi.org/project/pep8-naming/)
 - [`yesqa`](https://github.com/asottile/yesqa)
 - [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
 - [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (9/32)
- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (10/32)
+- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (10/34)
 - [`autoflake`](https://pypi.org/project/autoflake/) (1/7)

 Beyond rule-set parity, Ruff suffers from the following limitations vis-à-vis Flake8:
@@ -495,15 +535,17 @@ Beyond rule-set parity, Ruff suffers from the following limitations vis-à-vis F

 Today, Ruff can be used to replace Flake8 when used with any of the following plugins:

+- [`pep8-naming`](https://pypi.org/project/pep8-naming/)
 - [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
 - [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (9/32)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (10/32)

 Ruff also implements the functionality that you get from [`yesqa`](https://github.com/asottile/yesqa),
-and a subset of the rules implemented in [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34).
+and a subset of the rules implemented in [`pyupgrade`](https://pypi.org/project/pyupgrade/) (10/34).

 If you're looking to use Ruff, but rely on an unsupported Flake8 plugin, free to file an Issue.

@@ -529,35 +571,55 @@ Yes! To enable a specific docstring convention, start by enabling all `pydocstyl
 then selectively disabling based on your [preferred convention](https://www.pydocstyle.org/en/latest/error_codes.html#default-conventions).

 For example, if you're coming from `flake8-docstrings`, the following configuration is equivalent to
-`--docstring-convention numpy`:
+`--docstring-convention=numpy`:

 ```toml
 [tool.ruff]
-extend-select = [
-    "D100",
-    "D101",
-    "D102",
-    "D103",
-    "D104",
-    "D105",
-    "D106",
-    "D200",
-    "D201",
-    "D202",
+extend-select = ["D"]
+extend-ignore = [
+    "D107",
+    "D203",
+    "D212",
+    "D213",
+    "D402",
+    "D413",
+    "D415",
+    "D416",
+    "D417",
+]
+```
+
+Similarly, the following is equivalent to `--docstring-convention=google`:
+
+```toml
+[tool.ruff]
+extend-select = ["D"]
+extend-ignore = [
+    "D203",
    "D204",
-    "D205",
-    "D206",
-    "D207",
-    "D208",
-    "D209",
-    "D210",
-    "D211",
+    "D213",
+    "D215",
+    "D400",
+    "D404",
+    "D406",
+    "D407",
+    "D408",
+    "D409",
+    "D413",
+]
+```
+
+Similarly, the following is equivalent to `--docstring-convention=pep8`:
+
+```toml
+[tool.ruff]
+extend-select = ["D"]
+extend-ignore = [
+    "D203",
+    "D212",
+    "D213",
    "D214",
    "D215",
-    "D300",
-    "D400",
-    "D402",
-    "D403",
    "D404",
    "D405",
    "D406",
@@ -566,66 +628,30 @@ extend-select = [
    "D409",
    "D410",
    "D411",
-    "D412",
    "D413",
-    "D418",
-    "D419",
-]
-```
-
-Similarly, the following is equivalent to `--docstring-convention google`:
-
-```toml
-[tool.ruff]
-extend-select = [
-    "D100",
-    "D101",
-    "D102",
-    "D103",
-    "D104",
-    "D105",
-    "D106",
-    "D107",
-    "D200",
-    "D201",
-    "D202",
-    "D205",
-    "D206",
-    "D207",
-    "D208",
-    "D209",
-    "D210",
-    "D211",
-    "D212",
-    "D214",
-    "D300",
-    "D402",
-    "D403",
-    "D405",
-    "D410",
-    "D411",
-    "D412",
-    "D414",
    "D415",
    "D416",
    "D417",
-    "D418",
-    "D419",
 ]
 ```

 ## Development

-Ruff is written in Rust (1.63.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
+Ruff is written in Rust (1.64.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
 for development.

 Assuming you have `cargo` installed, you can run:

 ```shell
 cargo run resources/test/fixtures
-cargo fmt
-cargo clippy
-cargo test
+```
+
+For development, we use [nightly Rust](https://rust-lang.github.io/rustup/concepts/channels.html#working-with-nightly-rust):
+
+```shell
+cargo +nightly fmt
+cargo +nightly clippy
+cargo +nightly test
 ```

 ## Releases
--- a/benches/source_code_locator.rs
+++ b/benches/source_code_locator.rs
@@ -0,0 +1,15 @@
+use std::path::Path;
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use ruff::fs;
+use ruff::source_code_locator::compute_offsets;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let contents = fs::read_file(Path::new("resources/test/fixtures/D.py")).unwrap();
+    c.bench_function("compute_offsets", |b| {
+        b.iter(|| compute_offsets(black_box(&contents)))
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);
--- a/crates/flake8_to_ruff/Cargo.lock
+++ b/crates/flake8_to_ruff/Cargo.lock
--- a/crates/flake8_to_ruff/Cargo.toml
+++ b/crates/flake8_to_ruff/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "flake8-to-ruff"
+version = "0.0.97-dev.0"
+edition = "2021"
+
+[lib]
+name = "flake8_to_ruff"
+
+[dependencies]
+anyhow = { version = "1.0.60" }
+clap = { version = "4.0.1", features = ["derive"] }
+configparser = { version = "3.0.2" }
+once_cell = { version = "1.13.1" }
+regex = { version = "1.6.0" }
+ruff = { path = "../..", default-features = false }
+serde = { version = "1.0.143", features = ["derive"] }
+serde_json = { version = "1.0.83" }
+toml = { version = "0.5.9" }
+
+[dev-dependencies]
+
+[features]
--- a/crates/flake8_to_ruff/README.md
+++ b/crates/flake8_to_ruff/README.md
@@ -0,0 +1,47 @@
+# flake8-to-ruff
+
+Convert existing Flake8 configuration files (`setup.cfg`, `tox.ini`, or `.flake8`) for use with
+[Ruff](https://github.com/charliermarsh/ruff).
+
+Generates a Ruff-compatible `pyproject.toml` section.
+
+## Installation and Usage
+
+### Installation
+
+Available as [`flake8-to-ruff`](https://pypi.org/project/flake8-to-ruff/) on PyPI:
+
+```shell
+pip install flake8-to-ruff
+```
+
+### Usage
+
+To run Ruff, try any of the following:
+
+```shell
+flake8-to-ruff path/to/setup.cfg
+flake8-to-ruff path/to/tox.ini
+flake8-to-ruff path/to/.flake8
+```
+
+## Limitations
+
+1. Ruff only supports a subset of the Flake configuration options. `flake8-to-ruff` will warn on and
+   ignore unsupported options in the `.flake8` file (or equivalent). (Similarly, Ruff has a few
+   configuration options that don't exist in Flake8.)
+2. Ruff will omit any error codes that are unimplemented or unsupported by Ruff, including error
+   codes from unsupported plugins. (See the [Ruff README](https://github.com/charliermarsh/ruff#user-content-how-does-ruff-compare-to-flake8)
+   for the complete list of supported plugins.)
+3. `flake8-to-ruff` does not auto-detect your Flake8 plugins, so any reliance on Flake8 plugins that
+   implicitly enable third-party checks will be ignored. Instead, add those error codes to your
+   `select` or `extend-select` fields, so that `flake8-to-ruff` can pick them up.
+
+## License
+
+MIT
+
+## Contributing
+
+Contributions are welcome and hugely appreciated. To get started, check out the
+[contributing guidelines](https://github.com/charliermarsh/ruff/blob/main/CONTRIBUTING.md).
--- a/crates/flake8_to_ruff/pyproject.toml
+++ b/crates/flake8_to_ruff/pyproject.toml
@@ -0,0 +1,33 @@
+[project]
+name = "flake8-to-ruff"
+keywords = ["automation", "flake8", "pycodestyle", "pyflakes", "pylint", "clippy"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3 :: Only",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: Quality Assurance",
+]
+author = "Charlie Marsh"
+author_email = "charlie.r.marsh@gmail.com"
+description = "Convert existing Flake8 configuration to Ruff."
+requires-python = ">=3.7"
+
+[project.urls]
+repository = "https://github.com/charliermarsh/ruff#subdirectory=crates/flake8_to_ruff"
+
+[build-system]
+requires = ["maturin>=0.13,<0.14"]
+build-backend = "maturin"
+
+[tool.maturin]
+bindings = "bin"
+strip = true
--- a/crates/flake8_to_ruff/src/converter.rs
+++ b/crates/flake8_to_ruff/src/converter.rs
@@ -0,0 +1,243 @@
+use std::collections::HashMap;
+
+use anyhow::Result;
+use ruff::flake8_quotes::settings::Quote;
+use ruff::settings::options::Options;
+use ruff::settings::pyproject::Pyproject;
+use ruff::{flake8_quotes, pep8_naming};
+
+use crate::parser;
+
+pub fn convert(config: HashMap<String, HashMap<String, Option<String>>>) -> Result<Pyproject> {
+    // Extract the Flake8 section.
+    let flake8 = config
+        .get("flake8")
+        .expect("Unable to find flake8 section in INI file.");
+
+    // Parse each supported option.
+    let mut options: Options = Default::default();
+    let mut flake8_quotes: flake8_quotes::settings::Options = Default::default();
+    let mut pep8_naming: pep8_naming::settings::Options = Default::default();
+    for (key, value) in flake8 {
+        if let Some(value) = value {
+            match key.as_str() {
+                // flake8
+                "max-line-length" | "max_line_length" => match value.clone().parse::<usize>() {
+                    Ok(line_length) => options.line_length = Some(line_length),
+                    Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                },
+                "select" => {
+                    options.select = Some(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "extend-select" | "extend_select" => {
+                    options.extend_select = Some(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "ignore" => {
+                    options.ignore = Some(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "extend-ignore" | "extend_ignore" => {
+                    options.extend_ignore = Some(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "exclude" => {
+                    options.exclude = Some(parser::parse_strings(value.as_ref()));
+                }
+                "extend-exclude" | "extend_exclude" => {
+                    options.extend_exclude = Some(parser::parse_strings(value.as_ref()));
+                }
+                "per-file-ignores" | "per_file_ignores" => {
+                    match parser::parse_files_to_codes_mapping(value.as_ref()) {
+                        Ok(per_file_ignores) => {
+                            options.per_file_ignores =
+                                Some(parser::collect_per_file_ignores(per_file_ignores))
+                        }
+                        Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                    }
+                }
+                // flake8-quotes
+                "quotes" | "inline-quotes" | "inline_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.inline_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.inline_quotes = Some(Quote::Single),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                "multiline-quotes" | "multiline_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.multiline_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.multiline_quotes = Some(Quote::Single),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                "docstring-quotes" | "docstring_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.docstring_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.docstring_quotes = Some(Quote::Single),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                "avoid-escape" | "avoid_escape" => match value.trim() {
+                    "true" => flake8_quotes.avoid_escape = Some(true),
+                    "false" => flake8_quotes.avoid_escape = Some(false),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                // pep8-naming
+                "ignore-names" | "ignore_names" => {
+                    pep8_naming.ignore_names = Some(parser::parse_strings(value.as_ref()));
+                }
+                "classmethod-decorators" | "classmethod_decorators" => {
+                    pep8_naming.classmethod_decorators =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                "staticmethod-decorators" | "staticmethod_decorators" => {
+                    pep8_naming.staticmethod_decorators =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                // Unknown
+                _ => eprintln!("Skipping unsupported property: {key}"),
+            }
+        }
+    }
+
+    if flake8_quotes != Default::default() {
+        options.flake8_quotes = Some(flake8_quotes);
+    }
+    if pep8_naming != Default::default() {
+        options.pep8_naming = Some(pep8_naming);
+    }
+
+    // Create the pyproject.toml.
+    Ok(Pyproject::new(options))
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+
+    use anyhow::Result;
+    use ruff::flake8_quotes;
+    use ruff::settings::options::Options;
+    use ruff::settings::pyproject::Pyproject;
+
+    use crate::converter::convert;
+
+    #[test]
+    fn it_converts_empty() -> Result<()> {
+        let actual = convert(HashMap::from([("flake8".to_string(), HashMap::from([]))]))?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: None,
+            extend_select: None,
+            ignore: None,
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_dashes() -> Result<()> {
+        let actual = convert(HashMap::from([(
+            "flake8".to_string(),
+            HashMap::from([("max-line-length".to_string(), Some("100".to_string()))]),
+        )]))?;
+        let expected = Pyproject::new(Options {
+            line_length: Some(100),
+            exclude: None,
+            extend_exclude: None,
+            select: None,
+            extend_select: None,
+            ignore: None,
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_underscores() -> Result<()> {
+        let actual = convert(HashMap::from([(
+            "flake8".to_string(),
+            HashMap::from([("max_line_length".to_string(), Some("100".to_string()))]),
+        )]))?;
+        let expected = Pyproject::new(Options {
+            line_length: Some(100),
+            exclude: None,
+            extend_exclude: None,
+            select: None,
+            extend_select: None,
+            ignore: None,
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_ignores_parse_errors() -> Result<()> {
+        let actual = convert(HashMap::from([(
+            "flake8".to_string(),
+            HashMap::from([("max_line_length".to_string(), Some("abc".to_string()))]),
+        )]))?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: None,
+            extend_select: None,
+            ignore: None,
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_extensions() -> Result<()> {
+        let actual = convert(HashMap::from([(
+            "flake8".to_string(),
+            HashMap::from([("inline-quotes".to_string(), Some("single".to_string()))]),
+        )]))?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: None,
+            extend_select: None,
+            ignore: None,
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: Some(flake8_quotes::settings::Options {
+                inline_quotes: Some(flake8_quotes::settings::Quote::Single),
+                multiline_quotes: None,
+                docstring_quotes: None,
+                avoid_escape: None,
+            }),
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/crates/flake8_to_ruff/src/lib.rs
+++ b/crates/flake8_to_ruff/src/lib.rs
@@ -0,0 +1,4 @@
+#![allow(clippy::collapsible_if, clippy::collapsible_else_if)]
+
+pub mod converter;
+mod parser;
--- a/crates/flake8_to_ruff/src/main.rs
+++ b/crates/flake8_to_ruff/src/main.rs
@@ -0,0 +1,35 @@
+//! Utility to generate Ruff's pyproject.toml section from a Flake8 INI file.
+
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+use configparser::ini::Ini;
+use flake8_to_ruff::converter;
+
+#[derive(Parser)]
+#[command(
+    about = "Convert existing Flake8 configuration to Ruff.",
+    long_about = None
+)]
+struct Cli {
+    /// Path to the Flake8 configuration file (e.g., 'setup.cfg', 'tox.ini', or
+    /// '.flake8').
+    #[arg(required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    // Read the INI file.
+    let mut ini = Ini::new_cs();
+    ini.set_multiline(true);
+    let config = ini.load(cli.file).map_err(|msg| anyhow::anyhow!(msg))?;
+
+    // Create the pyproject.toml.
+    let pyproject = converter::convert(config)?;
+    println!("{}", toml::to_string_pretty(&pyproject)?);
+
+    Ok(())
+}
--- a/crates/flake8_to_ruff/src/parser.rs
+++ b/crates/flake8_to_ruff/src/parser.rs
@@ -0,0 +1,373 @@
+use std::collections::BTreeMap;
+use std::str::FromStr;
+
+use anyhow::Result;
+use once_cell::sync::Lazy;
+use regex::Regex;
+use ruff::checks_gen::CheckCodePrefix;
+use ruff::settings::types::PatternPrefixPair;
+
+static COMMA_SEPARATED_LIST_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").unwrap());
+
+/// Parse a comma-separated list of `CheckCodePrefix` values (e.g.,
+/// "F401,E501").
+pub fn parse_prefix_codes(value: &str) -> Vec<CheckCodePrefix> {
+    let mut codes: Vec<CheckCodePrefix> = vec![];
+    for code in COMMA_SEPARATED_LIST_RE.split(value) {
+        let code = code.trim();
+        if code.is_empty() {
+            continue;
+        }
+        if let Ok(code) = CheckCodePrefix::from_str(code) {
+            codes.push(code);
+        } else {
+            eprintln!("Unsupported prefix code: {code}");
+        }
+    }
+    codes
+}
+
+/// Parse a comma-separated list of strings (e.g., "__init__.py,__main__.py").
+pub fn parse_strings(value: &str) -> Vec<String> {
+    COMMA_SEPARATED_LIST_RE
+        .split(value)
+        .map(|part| part.trim())
+        .filter(|part| !part.is_empty())
+        .map(String::from)
+        .collect()
+}
+
+#[derive(Debug)]
+struct Token {
+    token_name: TokenType,
+    src: String,
+}
+
+#[derive(Debug)]
+enum TokenType {
+    Code,
+    File,
+    Colon,
+    Comma,
+    Ws,
+    Eof,
+}
+
+struct State {
+    seen_sep: bool,
+    seen_colon: bool,
+    filenames: Vec<String>,
+    codes: Vec<String>,
+}
+
+impl State {
+    fn new() -> Self {
+        Self {
+            seen_sep: true,
+            seen_colon: false,
+            filenames: vec![],
+            codes: vec![],
+        }
+    }
+
+    /// Generate the list of `StrCheckCodePair` pairs for the current state.
+    fn parse(&self) -> Vec<PatternPrefixPair> {
+        let mut codes: Vec<PatternPrefixPair> = vec![];
+        for code in &self.codes {
+            match CheckCodePrefix::from_str(code) {
+                Ok(code) => {
+                    for filename in &self.filenames {
+                        codes.push(PatternPrefixPair {
+                            pattern: filename.clone(),
+                            prefix: code.clone(),
+                        });
+                    }
+                }
+                Err(_) => eprintln!("Skipping unrecognized prefix: {}", code),
+            }
+        }
+        codes
+    }
+}
+
+/// Tokenize the raw 'files-to-codes' mapping.
+fn tokenize_files_to_codes_mapping(value: &str) -> Vec<Token> {
+    let mut tokens = vec![];
+    let mut i = 0;
+    while i < value.len() {
+        for (token_re, token_name) in [
+            (
+                Regex::new(r"([A-Z]+[0-9]*)(?:$|\s|,)").unwrap(),
+                TokenType::Code,
+            ),
+            (Regex::new(r"([^\s:,]+)").unwrap(), TokenType::File),
+            (Regex::new(r"(\s*:\s*)").unwrap(), TokenType::Colon),
+            (Regex::new(r"(\s*,\s*)").unwrap(), TokenType::Comma),
+            (Regex::new(r"(\s+)").unwrap(), TokenType::Ws),
+        ] {
+            if let Some(cap) = token_re.captures(&value[i..]) {
+                let mat = cap.get(1).unwrap();
+                if mat.start() == 0 {
+                    tokens.push(Token {
+                        token_name,
+                        src: mat.as_str().to_string().trim().to_string(),
+                    });
+                    i += mat.end();
+                    break;
+                }
+            }
+        }
+    }
+    tokens.push(Token {
+        token_name: TokenType::Eof,
+        src: "".to_string(),
+    });
+    tokens
+}
+
+/// Parse a 'files-to-codes' mapping, mimicking Flake8's internal logic.
+///
+/// See: https://github.com/PyCQA/flake8/blob/7dfe99616fc2f07c0017df2ba5fa884158f3ea8a/src/flake8/utils.py#L45
+pub fn parse_files_to_codes_mapping(value: &str) -> Result<Vec<PatternPrefixPair>> {
+    if value.trim().is_empty() {
+        return Ok(vec![]);
+    }
+    let mut codes: Vec<PatternPrefixPair> = vec![];
+    let mut state = State::new();
+    for token in tokenize_files_to_codes_mapping(value) {
+        if matches!(token.token_name, TokenType::Comma | TokenType::Ws) {
+            state.seen_sep = true;
+        } else if !state.seen_colon {
+            if matches!(token.token_name, TokenType::Colon) {
+                state.seen_colon = true;
+                state.seen_sep = true;
+            } else if state.seen_sep && matches!(token.token_name, TokenType::File) {
+                state.filenames.push(token.src);
+                state.seen_sep = false;
+            } else {
+                return Err(anyhow::anyhow!("Unexpected token: {:?}", token.token_name));
+            }
+        } else {
+            if matches!(token.token_name, TokenType::Eof) {
+                codes.extend(state.parse());
+                state = State::new();
+            } else if state.seen_sep && matches!(token.token_name, TokenType::Code) {
+                state.codes.push(token.src);
+                state.seen_sep = false;
+            } else if state.seen_sep && matches!(token.token_name, TokenType::File) {
+                codes.extend(state.parse());
+                state = State::new();
+                state.filenames.push(token.src);
+                state.seen_sep = false;
+            } else {
+                return Err(anyhow::anyhow!("Unexpected token: {:?}", token.token_name));
+            }
+        }
+    }
+    Ok(codes)
+}
+
+/// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
+pub fn collect_per_file_ignores(
+    pairs: Vec<PatternPrefixPair>,
+) -> BTreeMap<String, Vec<CheckCodePrefix>> {
+    let mut per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>> = BTreeMap::new();
+    for pair in pairs {
+        per_file_ignores
+            .entry(pair.pattern)
+            .or_insert_with(Vec::new)
+            .push(pair.prefix);
+    }
+    per_file_ignores
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use ruff::checks_gen::CheckCodePrefix;
+    use ruff::settings::types::PatternPrefixPair;
+
+    use crate::parser::{parse_files_to_codes_mapping, parse_prefix_codes, parse_strings};
+
+    #[test]
+    fn it_parses_prefix_codes() {
+        let actual = parse_prefix_codes("");
+        let expected: Vec<CheckCodePrefix> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes(" ");
+        let expected: Vec<CheckCodePrefix> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401");
+        let expected = vec![CheckCodePrefix::F401];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,");
+        let expected = vec![CheckCodePrefix::F401];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,E501");
+        let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401, E501");
+        let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_parses_strings() {
+        let actual = parse_strings("");
+        let expected: Vec<String> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings(" ");
+        let expected: Vec<String> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py");
+        let expected = vec!["__init__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py,");
+        let expected = vec!["__init__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py,__main__.py");
+        let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py, __main__.py");
+        let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_parse_files_to_codes_mapping() -> Result<()> {
+        let actual = parse_files_to_codes_mapping("")?;
+        let expected: Vec<PatternPrefixPair> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_files_to_codes_mapping(" ")?;
+        let expected: Vec<PatternPrefixPair> = vec![];
+        assert_eq!(actual, expected);
+
+        // Ex) locust
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+    locust/test/*: F841
+    examples/*: F841
+    *.pyi: E302,E704"
+                .strip_prefix("per-file-ignores =")
+                .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "locust/test/*".to_string(),
+                prefix: CheckCodePrefix::F841,
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: CheckCodePrefix::F841,
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        // Ex) celery
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+   t/*,setup.py,examples/*,docs/*,extra/*:
+       D,"
+            .strip_prefix("per-file-ignores =")
+            .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "t/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "setup.py".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "docs/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "extra/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        // Ex) scrapy
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+    scrapy/__init__.py:E402
+    scrapy/core/downloader/handlers/http.py:F401
+    scrapy/http/__init__.py:F401
+    scrapy/linkextractors/__init__.py:E402,F401
+    scrapy/selector/__init__.py:F401
+    scrapy/spiders/__init__.py:E402,F401
+    scrapy/utils/url.py:F403,F405
+    tests/test_loader.py:E741"
+                .strip_prefix("per-file-ignores =")
+                .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "scrapy/__init__.py".to_string(),
+                prefix: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/core/downloader/handlers/http.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/http/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/selector/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: CheckCodePrefix::F403,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: CheckCodePrefix::F405,
+            },
+            PatternPrefixPair {
+                pattern: "tests/test_loader.py".to_string(),
+                prefix: CheckCodePrefix::E741,
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/examples/generate_check_code_prefix.rs
+++ b/examples/generate_check_code_prefix.rs
@@ -0,0 +1,104 @@
+//! Generate the CheckCodePrefix enum.
+
+use std::collections::{BTreeMap, BTreeSet};
+
+use codegen::{Scope, Type, Variant};
+use itertools::Itertools;
+use ruff::checks::CheckCode;
+use strum::IntoEnumIterator;
+
+fn main() {
+    // Build up a map from prefix to matching CheckCodes.
+    let mut prefix_to_codes: BTreeMap<String, BTreeSet<CheckCode>> = Default::default();
+    for check_code in CheckCode::iter() {
+        let as_ref = check_code.as_ref().to_string();
+        for i in 1..=as_ref.len() {
+            let prefix = as_ref[..i].to_string();
+            let entry = prefix_to_codes
+                .entry(prefix)
+                .or_insert_with(|| Default::default());
+            entry.insert(check_code.clone());
+        }
+    }
+
+    let mut scope = Scope::new();
+
+    // Create the `CheckCodePrefix` definition.
+    let mut gen = scope
+        .new_enum("CheckCodePrefix")
+        .vis("pub")
+        .derive("EnumString")
+        .derive("Debug")
+        .derive("PartialEq")
+        .derive("Eq")
+        .derive("Clone")
+        .derive("Serialize")
+        .derive("Deserialize");
+    for (prefix, _) in &prefix_to_codes {
+        gen = gen.push_variant(Variant::new(prefix.to_string()));
+    }
+
+    // Create the `PrefixSpecificity` definition.
+    scope
+        .new_enum("PrefixSpecificity")
+        .vis("pub")
+        .derive("PartialEq")
+        .derive("Eq")
+        .derive("PartialOrd")
+        .derive("Ord")
+        .push_variant(Variant::new("Category"))
+        .push_variant(Variant::new("Hundreds"))
+        .push_variant(Variant::new("Tens"))
+        .push_variant(Variant::new("Explicit"));
+
+    // Create the `match` statement, to map from definition to relevant codes.
+    let mut gen = scope
+        .new_impl("CheckCodePrefix")
+        .new_fn("codes")
+        .arg_ref_self()
+        .ret(Type::new("Vec<CheckCode>"))
+        .vis("pub")
+        .line("match self {");
+    for (prefix, codes) in &prefix_to_codes {
+        gen = gen.line(format!(
+            "CheckCodePrefix::{prefix} => vec![{}],",
+            codes
+                .iter()
+                .map(|code| format!("CheckCode::{}", code.as_ref()))
+                .join(", ")
+        ));
+    }
+    gen.line("}");
+
+    // Create the `match` statement, to map from definition to specificity.
+    let mut gen = scope
+        .new_impl("CheckCodePrefix")
+        .new_fn("specificity")
+        .arg_ref_self()
+        .ret(Type::new("PrefixSpecificity"))
+        .vis("pub")
+        .line("match self {");
+    for (prefix, _) in &prefix_to_codes {
+        let specificity = match prefix.len() {
+            4 => "Explicit",
+            3 => "Tens",
+            2 => "Hundreds",
+            1 => "Category",
+            _ => panic!("Invalid prefix: {}", prefix),
+        };
+        gen = gen.line(format!(
+            "CheckCodePrefix::{prefix} => PrefixSpecificity::{},",
+            specificity
+        ));
+    }
+    gen.line("}");
+
+    println!("//! File automatically generated by examples/generate_check_code_prefix.rs.");
+    println!();
+    println!("use serde::{{Serialize, Deserialize}};");
+    println!("use strum_macros::EnumString;");
+    println!();
+    println!("use crate::checks::CheckCode;");
+    println!();
+    println!("{}", scope.to_string());
+}
--- a/examples/generate_rules_table.rs
+++ b/examples/generate_rules_table.rs
@@ -1,8 +1,7 @@
 //! Generate a Markdown-compatible table of supported lint rules.

-use strum::IntoEnumIterator;
-
 use ruff::checks::{CheckCategory, CheckCode};
+use strum::IntoEnumIterator;

 fn main() {
    for check_category in CheckCategory::iter() {
--- a/examples/generate_source_code.rs
+++ b/examples/generate_source_code.rs
@@ -2,10 +2,9 @@ use std::path::PathBuf;

 use anyhow::Result;
 use clap::Parser;
-use rustpython_parser::parser;
-
 use ruff::code_gen::SourceGenerator;
 use ruff::fs;
+use rustpython_parser::parser;

 #[derive(Debug, Parser)]
 struct Cli {
--- a/examples/print_ast.rs
+++ b/examples/print_ast.rs
@@ -4,9 +4,8 @@ use std::path::PathBuf;

 use anyhow::Result;
 use clap::Parser;
-use rustpython_parser::parser;
-
 use ruff::fs;
+use rustpython_parser::parser;

 #[derive(Debug, Parser)]
 struct Cli {
--- a/examples/print_tokens.rs
+++ b/examples/print_tokens.rs
@@ -4,9 +4,8 @@ use std::path::PathBuf;

 use anyhow::Result;
 use clap::Parser;
-use rustpython_parser::lexer;
-
 use ruff::fs;
+use rustpython_parser::lexer;

 #[derive(Debug, Parser)]
 struct Cli {
--- a/resources/test/fixtures/B006_B008.py
+++ b/resources/test/fixtures/B006_B008.py
@@ -0,0 +1,187 @@
+import collections
+import datetime as dt
+import logging
+import operator
+import random
+import re
+import time
+import types
+from operator import attrgetter, itemgetter, methodcaller
+from types import MappingProxyType
+
+
+# B006
+# Allow immutable literals/calls/comprehensions
+def this_is_okay(value=(1, 2, 3)):
+    ...
+
+
+async def and_this_also(value=tuple()):
+    pass
+
+
+def frozenset_also_okay(value=frozenset()):
+    pass
+
+
+def mappingproxytype_okay(
+    value=MappingProxyType({}), value2=types.MappingProxyType({})
+):
+    pass
+
+
+def re_compile_ok(value=re.compile("foo")):
+    pass
+
+
+def operators_ok(
+    v=operator.attrgetter("foo"),
+    v2=operator.itemgetter("foo"),
+    v3=operator.methodcaller("foo"),
+):
+    pass
+
+
+def operators_ok_unqualified(
+    v=attrgetter("foo"),
+    v2=itemgetter("foo"),
+    v3=methodcaller("foo"),
+):
+    pass
+
+
+def kwonlyargs_immutable(*, value=()):
+    ...
+
+
+# Flag mutable literals/comprehensions
+
+
+def this_is_wrong(value=[1, 2, 3]):
+    ...
+
+
+def this_is_also_wrong(value={}):
+    ...
+
+
+def and_this(value=set()):
+    ...
+
+
+def this_too(value=collections.OrderedDict()):
+    ...
+
+
+async def async_this_too(value=collections.defaultdict()):
+    ...
+
+
+def dont_forget_me(value=collections.deque()):
+    ...
+
+
+# N.B. we're also flagging the function call in the comprehension
+def list_comprehension_also_not_okay(default=[i**2 for i in range(3)]):
+    pass
+
+
+def dict_comprehension_also_not_okay(default={i: i**2 for i in range(3)}):
+    pass
+
+
+def set_comprehension_also_not_okay(default={i**2 for i in range(3)}):
+    pass
+
+
+def kwonlyargs_mutable(*, value=[]):
+    ...
+
+
+# Recommended approach for mutable defaults
+def do_this_instead(value=None):
+    if value is None:
+        value = set()
+
+
+# B008
+# Flag function calls as default args (including if they are part of a sub-expression)
+def in_fact_all_calls_are_wrong(value=time.time()):
+    ...
+
+
+def f(when=dt.datetime.now() + dt.timedelta(days=7)):
+    pass
+
+
+def can_even_catch_lambdas(a=(lambda x: x)()):
+    ...
+
+
+# Recommended approach for function calls as default args
+LOGGER = logging.getLogger(__name__)
+
+
+def do_this_instead_of_calls_in_defaults(logger=LOGGER):
+    # That makes it more obvious that this one value is reused.
+    ...
+
+
+# Handle inf/infinity/nan special case
+def float_inf_okay(value=float("inf")):
+    pass
+
+
+def float_infinity_okay(value=float("infinity")):
+    pass
+
+
+def float_plus_infinity_okay(value=float("+infinity")):
+    pass
+
+
+def float_minus_inf_okay(value=float("-inf")):
+    pass
+
+
+def float_nan_okay(value=float("nan")):
+    pass
+
+
+def float_minus_NaN_okay(value=float("-NaN")):
+    pass
+
+
+def float_infinity_literal(value=float("1e999")):
+    pass
+
+
+# But don't allow standard floats
+def float_int_is_wrong(value=float(3)):
+    pass
+
+
+def float_str_not_inf_or_nan_is_wrong(value=float("3.14")):
+    pass
+
+
+# B006 and B008
+# We should handle arbitrary nesting of these B008.
+def nested_combo(a=[float(3), dt.datetime.now()]):
+    pass
+
+
+# Don't flag nested B006 since we can't guarantee that
+# it isn't made mutable by the outer operation.
+def no_nested_b006(a=map(lambda s: s.upper(), ["a", "b", "c"])):
+    pass
+
+
+# B008-ception.
+def nested_b008(a=random.randint(0, dt.datetime.now().year)):
+    pass
+
+
+# Ignore lambda contents since they are evaluated at call time.
+def foo(f=lambda x: print(x)):
+    f(1)
--- a/resources/test/fixtures/B013.py
+++ b/resources/test/fixtures/B013.py
@@ -0,0 +1,8 @@
+try:
+    pass
+except (ValueError,):
+    pass
+except AttributeError:
+    pass
+except (ImportError, TypeError):
+    pass
--- a/resources/test/fixtures/C400.py
+++ b/resources/test/fixtures/C400.py
@@ -1 +1,4 @@
 x = list(x for x in range(3))
+x = list(
+    x for x in range(3)
+)
--- a/resources/test/fixtures/C401.py
+++ b/resources/test/fixtures/C401.py
@@ -1 +1,4 @@
 x = set(x for x in range(3))
+x = set(
+    x for x in range(3)
+)
--- a/resources/test/fixtures/C402.py
+++ b/resources/test/fixtures/C402.py
@@ -1 +1,5 @@
-d = dict((x, x) for x in range(3))
+dict((x, x) for x in range(3))
+dict(
+    (x, x) for x in range(3)
+)
+dict(((x, x) for x in range(3)), z=3)
--- a/resources/test/fixtures/C403.py
+++ b/resources/test/fixtures/C403.py
@@ -1 +1,4 @@
 s = set([x for x in range(3)])
+s = set(
+    [x for x in range(3)]
+)
--- a/resources/test/fixtures/C404.py
+++ b/resources/test/fixtures/C404.py
@@ -1 +1,2 @@
-d = dict([(i, i) for i in range(3)])
+dict([(i, i) for i in range(3)])
+dict([(i, i) for i in range(3)], z=4)
--- a/resources/test/fixtures/C409.py
+++ b/resources/test/fixtures/C409.py
@@ -1,3 +1,10 @@
-t1 = tuple([1, 2])
-t2 = tuple((1, 2))
-t3 = tuple([])
+t1 = tuple([])
+t2 = tuple([1, 2])
+t3 = tuple((1, 2))
+t4 = tuple([
+    1,
+    2
+])
+t5 = tuple(
+    (1, 2)
+)
--- a/resources/test/fixtures/F821_0.py
+++ b/resources/test/fixtures/F821_0.py
--- a/resources/test/fixtures/F821_1.py
+++ b/resources/test/fixtures/F821_1.py
@@ -0,0 +1,30 @@
+"""Test: typing module imports."""
+from foo import cast
+
+# OK
+x = cast("Model")
+
+from typing import cast
+
+
+# F821 Undefined name `Model`
+x = cast("Model", x)
+
+
+import typing
+
+
+# F821 Undefined name `Model`
+x = typing.cast("Model", x)
+
+
+from typing import Pattern
+
+# F821 Undefined name `Model`
+x = Pattern["Model"]
+
+
+from typing.re import Match
+
+# F821 Undefined name `Model`
+x = Match["Model"]
--- a/resources/test/fixtures/F821_2.py
+++ b/resources/test/fixtures/F821_2.py
@@ -0,0 +1,18 @@
+"""Test: typing_extensions module imports."""
+from foo import Literal
+
+# F821 Undefined name `Model`
+x: Literal["Model"]
+
+from typing_extensions import Literal
+
+
+# OK
+x: Literal["Model"]
+
+
+import typing_extensions
+
+
+# OK
+x: typing_extensions.Literal["Model"]
--- a/resources/test/fixtures/N802.py
+++ b/resources/test/fixtures/N802.py
@@ -1,3 +1,6 @@
+import unittest
+
+
 def Bad():
    pass

@@ -24,3 +27,15 @@ def _good():

 def good_func():
    pass
+
+
+def tearDownModule():
+    pass
+
+
+class Test(unittest.TestCase):
+    def tearDown(self):
+        return super().tearDown()
+
+    def testTest(self):
+        assert True
--- a/resources/test/fixtures/N806.py
+++ b/resources/test/fixtures/N806.py
@@ -0,0 +1,5 @@
+def f():
+    lower = 0
+    Camel = 0
+    CONSTANT = 0
+    _ = 0
--- a/resources/test/fixtures/N815.py
+++ b/resources/test/fixtures/N815.py
@@ -0,0 +1,6 @@
+class C:
+    lower = 0
+    CONSTANT = 0
+    mixedCase = 0
+    _mixedCase = 0
+    mixed_Case = 0
--- a/resources/test/fixtures/N816.py
+++ b/resources/test/fixtures/N816.py
@@ -0,0 +1,5 @@
+lower = 0
+CONSTANT = 0
+mixedCase = 0
+_mixedCase = 0
+mixed_Case = 0
--- a/resources/test/fixtures/N818.py
+++ b/resources/test/fixtures/N818.py
@@ -0,0 +1,10 @@
+class Error(Exception):
+    pass
+
+
+class AnotherError(Exception):
+    pass
+
+
+class C(Exception):
+    pass
--- a/resources/test/fixtures/init.py
+++ b/resources/test/fixtures/init.py
@@ -1,3 +1,5 @@
+import os
+
 print(__path__)

 __all__ = ["a", "b", "c"]
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles.py
@@ -0,0 +1,38 @@
+"""
+Double quotes multiline module docstring
+"""
+
+"""
+this is not a docstring
+"""
+
+l = []
+
+class Cls:
+    """
+    Double quotes multiline class docstring
+    """
+
+    """
+    this is not a docstring
+    """
+
+    # The colon in the list indexing below is an edge case for the docstring scanner
+    def f(self, bar="""
+        definitely not a docstring""",
+        val=l[Cls():3]):
+        """
+        Double quotes multiline function docstring
+        """
+
+        some_expression = 'hello world'
+
+        """
+        this is not a docstring
+        """
+
+        if l:
+            """
+            Looks like a docstring, but in reality it isn't - only modules, classes and functions
+            """
+            pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_class.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_class.py
@@ -0,0 +1,9 @@
+class SingleLineDocstrings():
+    """ Double quotes single line class docstring """
+    """ Not a docstring """
+
+    def foo(self, bar="""not a docstring"""):
+        """ Double quotes single line method docstring"""
+        pass
+
+    class Nested(foo()[:]): """ inline docstring """; pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_function.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_function.py
@@ -0,0 +1,22 @@
+def foo():
+    """function without params, single line docstring"""
+    """ not a docstring"""
+    return
+
+
+def foo2():
+    """
+        function without params, multiline docstring
+    """
+    """ not a docstring"""
+    return
+
+
+def fun_with_params_no_docstring(a, b="""
+    not a
+""" """docstring"""):
+    pass
+
+def fun_with_params_no_docstring2(a, b=c[foo():], c=\
+    """ not a docstring """):
+    pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_module_multiline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_module_multiline.py
@@ -0,0 +1,11 @@
+"""
+Double quotes multiline module docstring
+"""
+"""
+this is not a docstring
+"""
+def foo():
+    pass
+"""
+this is not a docstring
+"""
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_module_singleline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_module_singleline.py
@@ -0,0 +1,6 @@
+""" Double quotes singleline module docstring """
+""" this is not a docstring """
+
+def foo():
+    pass
+""" this is not a docstring """
--- a/resources/test/fixtures/flake8_quotes/docstring_singles.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles.py
@@ -0,0 +1,40 @@
+'''
+Single quotes multiline module docstring
+'''
+
+'''
+this is not a docstring
+'''
+
+l = []
+
+class Cls(MakeKlass('''
+    class params \t not a docstring
+''')):
+    '''
+    Single quotes multiline class docstring
+    '''
+
+    '''
+    this is not a docstring
+    '''
+
+    # The colon in the list indexing below is an edge case for the docstring scanner
+    def f(self, bar='''
+        definitely not a docstring''',
+        val=l[Cls():3]):
+        '''
+        Single quotes multiline function docstring
+        '''
+
+        some_expression = 'hello world'
+
+        '''
+        this is not a docstring
+        '''
+
+        if l:
+            '''
+            Looks like a docstring, but in reality it isn't - only modules, classes and functions
+            '''
+            pass
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_class.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_class.py
@@ -0,0 +1,9 @@
+class SingleLineDocstrings():
+    ''' Double quotes single line class docstring '''
+    ''' Not a docstring '''
+
+    def foo(self, bar='''not a docstring'''):
+        ''' Double quotes single line method docstring'''
+        pass
+
+    class Nested(foo()[:]): ''' inline docstring '''; pass
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_function.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_function.py
@@ -0,0 +1,23 @@
+def foo():
+    '''function without params, single line docstring'''
+    ''' not a docstring'''
+    return
+
+
+def foo2():
+    '''
+        function without params, multiline docstring
+    '''
+    ''' not a docstring'''
+    return
+
+
+def fun_with_params_no_docstring(a, b='''
+    not a 
+''' '''docstring'''):
+    pass
+
+def fun_with_params_no_docstring2(a, b=c[foo():], c=\
+    ''' not a docstring '''):
+    pass
+
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_module_multiline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_module_multiline.py
@@ -0,0 +1,11 @@
+'''
+Double quotes multiline module docstring
+'''
+'''
+this is not a docstring
+'''
+def foo():
+    pass
+'''
+this is not a docstring
+'''
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_module_singleline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_module_singleline.py
@@ -0,0 +1,6 @@
+''' Double quotes singleline module docstring '''
+''' this is not a docstring '''
+
+def foo():
+    pass
+''' this is not a docstring '''
--- a/resources/test/fixtures/flake8_quotes/doubles.py
+++ b/resources/test/fixtures/flake8_quotes/doubles.py
@@ -0,0 +1,2 @@
+this_should_be_linted = "double quote string"
+this_should_be_linted = u"double quote string"
--- a/resources/test/fixtures/flake8_quotes/doubles_escaped.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_escaped.py
@@ -0,0 +1,5 @@
+this_should_raise_Q003 = 'This is a \'string\''
+this_is_fine = '"This" is a \'string\''
+this_is_fine = "This is a 'string'"
+this_is_fine = "\"This\" is a 'string'"
+this_is_fine = r'This is a \'string\''
--- a/resources/test/fixtures/flake8_quotes/doubles_multiline_string.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_multiline_string.py
@@ -0,0 +1,9 @@
+s = """ This "should"
+be
+"linted" """
+
+s = ''' This "should"
+"not" be
+"linted" '''
+
+s = """'This should not be linted due to having would-be quadruple end quote'"""
--- a/resources/test/fixtures/flake8_quotes/doubles_noqa.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_noqa.py
@@ -0,0 +1 @@
+this_should_not_be_linted = "double quote string"  # noqa
--- a/resources/test/fixtures/flake8_quotes/doubles_wrapped.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_wrapped.py
@@ -0,0 +1,2 @@
+s = 'double "quotes" wrapped in singles are ignored'
+s = "single 'quotes' wrapped in doubles are ignored"
--- a/resources/test/fixtures/flake8_quotes/singles.py
+++ b/resources/test/fixtures/flake8_quotes/singles.py
@@ -0,0 +1,2 @@
+this_should_be_linted = 'single quote string'
+this_should_be_linted = u'double quote string'
--- a/resources/test/fixtures/flake8_quotes/singles_escaped.py
+++ b/resources/test/fixtures/flake8_quotes/singles_escaped.py
@@ -0,0 +1,5 @@
+this_should_raise_Q003 = "This is a \"string\""
+this_is_fine = "'This' is a \"string\""
+this_is_fine = 'This is a "string"'
+this_is_fine = '\'This\' is a "string"'
+this_is_fine = r"This is a \"string\""
--- a/resources/test/fixtures/flake8_quotes/singles_multiline_string.py
+++ b/resources/test/fixtures/flake8_quotes/singles_multiline_string.py
@@ -0,0 +1,9 @@
+s = ''' This 'should'
+be
+'linted' '''
+
+s = """ This 'should'
+'not' be
+'linted' """
+
+s = '''"This should not be linted due to having would-be quadruple end quote"'''
--- a/resources/test/fixtures/flake8_quotes/singles_noqa.py
+++ b/resources/test/fixtures/flake8_quotes/singles_noqa.py
@@ -0,0 +1 @@
+this_should_not_be_linted = 'single quote string'  # noqa
--- a/resources/test/fixtures/flake8_quotes/singles_wrapped.py
+++ b/resources/test/fixtures/flake8_quotes/singles_wrapped.py
@@ -0,0 +1,2 @@
+s = "single 'quotes' wrapped in doubles are ignored"
+s = 'double "quotes" wrapped in singles are ignored'
--- a/resources/test/fixtures/pyproject.toml
+++ b/resources/test/fixtures/pyproject.toml
@@ -1,7 +1,36 @@
 [tool.ruff]
 line-length = 88
 extend-exclude = [
-    "excluded.py",
-    "migrations",
-    "directory/also_excluded.py",
+  "excluded.py",
+  "migrations",
+  "directory/also_excluded.py",
+]
+per-file-ignores = { "__init__.py" = ["F401"] }
+
+[tool.ruff.flake8-quotes]
+inline-quotes = "single"
+multiline-quotes = "double"
+docstring-quotes = "double"
+avoid-escape = true
+
+[tool.ruff.pep8-naming]
+ignore-names = [
+  "setUp",
+  "tearDown",
+  "setUpClass",
+  "tearDownClass",
+  "setUpModule",
+  "tearDownModule",
+  "asyncSetUp",
+  "asyncTearDown",
+  "setUpTestData",
+  "failureException",
+  "longMessage",
+  "maxDiff",
+]
+classmethod-decorators = [
+  "classmethod",
+]
+staticmethod-decorators = [
+  "staticmethod",
 ]
--- a/1
+++ b/1
@@ -0,0 +1 @@
+1.64.0
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -0,0 +1,15 @@
+condense_wildcard_suffixes = true
+edition = "2021"
+format_strings = true
+group_imports = "StdExternalCrate"
+hex_literal_case = "Lower"
+imports_granularity = "Module"
+max_width = 100
+normalize_comments = true
+normalize_doc_attributes = true
+reorder_impl_items = true
+reorder_imports = true
+reorder_modules = true
+unstable_features = true
+use_field_init_shorthand = true
+wrap_comments = true
--- a/scripts/.flake8
+++ b/scripts/.flake8
@@ -17,3 +17,5 @@ exclude =
    test_fstring.py,
    bad_coding2.py,
    badsyntax_*.py
+ignore_names = foo, bar
+quotes = double
--- a/src/ast/helpers.rs
+++ b/src/ast/helpers.rs
@@ -1,9 +1,9 @@
+use std::collections::BTreeSet;
+
 use once_cell::sync::Lazy;
 use regex::Regex;
 use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprKind, Location, StmtKind};

-use crate::python::typing;
-
 fn compose_call_path_inner<'a>(expr: &'a Expr, parts: &mut Vec<&'a str>) {
    match &expr.node {
        ExprKind::Call { func, .. } => {
@@ -30,6 +30,7 @@ pub fn compose_call_path(expr: &Expr) -> Option<String> {
    }
 }

+/// Return `true` if the `Expr` is a name or attribute reference to `${target}`.
 pub fn match_name_or_attr(expr: &Expr, target: &str) -> bool {
    match &expr.node {
        ExprKind::Attribute { attr, .. } => target == attr,
@@ -38,40 +39,36 @@ pub fn match_name_or_attr(expr: &Expr, target: &str) -> bool {
    }
 }

-pub enum SubscriptKind {
-    AnnotatedSubscript,
-    PEP593AnnotatedSubscript,
-}
-
-pub fn match_annotated_subscript(expr: &Expr) -> Option<SubscriptKind> {
+/// Return `true` if the `Expr` is a reference to `${module}.${target}`.
+///
+/// Useful for, e.g., ensuring that a `Union` reference represents
+/// `typing.Union`.
+pub fn match_name_or_attr_from_module(
+    expr: &Expr,
+    target: &str,
+    module: &str,
+    imports: Option<&BTreeSet<&str>>,
+) -> bool {
    match &expr.node {
-        ExprKind::Attribute { attr, .. } => {
-            if typing::is_annotated_subscript(attr) {
-                Some(SubscriptKind::AnnotatedSubscript)
-            } else if typing::is_pep593_annotated_subscript(attr) {
-                Some(SubscriptKind::PEP593AnnotatedSubscript)
-            } else {
-                None
-            }
-        }
+        ExprKind::Attribute { value, attr, .. } => match &value.node {
+            ExprKind::Name { id, .. } => id == module && target == attr,
+            _ => false,
+        },
        ExprKind::Name { id, .. } => {
-            if typing::is_annotated_subscript(id) {
-                Some(SubscriptKind::AnnotatedSubscript)
-            } else if typing::is_pep593_annotated_subscript(id) {
-                Some(SubscriptKind::PEP593AnnotatedSubscript)
-            } else {
-                None
-            }
+            target == id
+                && imports
+                    .map(|imports| imports.contains(&id.as_str()))
+                    .unwrap_or_default()
        }
-        _ => None,
+        _ => false,
    }
 }

 static DUNDER_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"__[^\s]+__").unwrap());

 pub fn is_assignment_to_a_dunder(node: &StmtKind) -> bool {
-    // Check whether it's an assignment to a dunder, with or without a type annotation.
-    // This is what pycodestyle (as of 2.9.1) does.
+    // Check whether it's an assignment to a dunder, with or without a type
+    // annotation. This is what pycodestyle (as of 2.9.1) does.
    match node {
        StmtKind::Assign {
            targets,
@@ -132,12 +129,13 @@ pub fn is_super_call_with_arguments(func: &Expr, args: &[Expr]) -> bool {
    }
 }

-/// Convert a location within a file (relative to `base`) to an absolute position.
+/// Convert a location within a file (relative to `base`) to an absolute
+/// position.
 pub fn to_absolute(relative: &Location, base: &Location) -> Location {
    if relative.row() == 1 {
        Location::new(
            relative.row() + base.row() - 1,
-            relative.column() + base.column() - 1,
+            relative.column() + base.column(),
        )
    } else {
        Location::new(relative.row() + base.row() - 1, relative.column())
--- a/src/ast/operations.rs
+++ b/src/ast/operations.rs
@@ -1,6 +1,6 @@
-use rustpython_parser::ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
+use rustpython_parser::ast::{Constant, Expr, ExprKind, Stmt, StmtKind};

-use crate::ast::types::{BindingKind, Range, Scope};
+use crate::ast::types::{BindingKind, Scope};

 /// Extract the names bound to a given __all__ assignment.
 pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
@@ -117,82 +117,3 @@ pub fn is_unpacking_assignment(stmt: &Stmt) -> bool {
    }
    false
 }
-
-/// Struct used to efficiently slice source code at (row, column) Locations.
-pub struct SourceCodeLocator<'a> {
-    content: &'a str,
-    offsets: Vec<Vec<usize>>,
-}
-
-impl<'a> SourceCodeLocator<'a> {
-    pub fn new(content: &'a str) -> Self {
-        SourceCodeLocator {
-            content,
-            offsets: Self::compute_offsets(content),
-        }
-    }
-
-    fn compute_offsets(content: &str) -> Vec<Vec<usize>> {
-        let mut offsets = vec![];
-        let mut offset = 0;
-        for line in content.lines() {
-            let mut newline = 0;
-            let mut line_offsets: Vec<usize> = vec![];
-            for (i, char) in line.char_indices() {
-                line_offsets.push(offset + i);
-                newline = i + char.len_utf8();
-            }
-            line_offsets.push(offset + newline);
-            offsets.push(line_offsets);
-            offset += newline + 1;
-        }
-        offsets.push(vec![offset]);
-        offsets
-    }
-
-    pub fn slice_source_code_at(&self, location: &Location) -> &'a str {
-        let offset = self.offsets[location.row() - 1][location.column() - 1];
-        &self.content[offset..]
-    }
-
-    pub fn slice_source_code_range(&self, range: &Range) -> &'a str {
-        let start = self.offsets[range.location.row() - 1][range.location.column() - 1];
-        let end = self.offsets[range.end_location.row() - 1][range.end_location.column() - 1];
-        &self.content[start..end]
-    }
-
-    pub fn partition_source_code_at(
-        &self,
-        outer: &Range,
-        inner: &Range,
-    ) -> (&'a str, &'a str, &'a str) {
-        let outer_start = self.offsets[outer.location.row() - 1][outer.location.column() - 1];
-        let outer_end = self.offsets[outer.end_location.row() - 1][outer.end_location.column() - 1];
-        let inner_start = self.offsets[inner.location.row() - 1][inner.location.column() - 1];
-        let inner_end = self.offsets[inner.end_location.row() - 1][inner.end_location.column() - 1];
-        (
-            &self.content[outer_start..inner_start],
-            &self.content[inner_start..inner_end],
-            &self.content[inner_end..outer_end],
-        )
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::SourceCodeLocator;
-
-    #[test]
-    fn source_code_locator_init() {
-        let content = "# \u{4e9c}\nclass Foo:\n    \"\"\".\"\"\"";
-        let locator = SourceCodeLocator::new(content);
-        assert_eq!(locator.offsets.len(), 4);
-        assert_eq!(locator.offsets[0], [0, 1, 2, 5]);
-        assert_eq!(locator.offsets[1], [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
-        assert_eq!(
-            locator.offsets[2],
-            [17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28]
-        );
-        assert_eq!(locator.offsets[3], [29]);
-    }
-}
--- a/src/ast/relocate.rs
+++ b/src/ast/relocate.rs
@@ -8,7 +8,8 @@ fn relocate_keyword(keyword: &mut Keyword, location: Range) {
    relocate_expr(&mut keyword.node.value, location);
 }

-/// Change an expression's location (recursively) to match a desired, fixed location.
+/// Change an expression's location (recursively) to match a desired, fixed
+/// location.
 pub fn relocate_expr(expr: &mut Expr, location: Range) {
    expr.location = location.location;
    expr.end_location = Some(location.end_location);
--- a/src/ast/types.rs
+++ b/src/ast/types.rs
@@ -85,8 +85,8 @@ pub enum BindingKind {
 pub struct Binding {
    pub kind: BindingKind,
    pub range: Range,
-    /// Tuple of (scope index, range) indicating the scope and range at which the binding was
-    /// last used.
+    /// Tuple of (scope index, range) indicating the scope and range at which
+    /// the binding was last used.
    pub used: Option<(usize, Range)>,
 }

--- a/src/autofix/fixer.rs
+++ b/src/autofix/fixer.rs
@@ -3,10 +3,11 @@ use std::collections::BTreeSet;
 use itertools::Itertools;
 use rustpython_parser::ast::Location;

-use crate::autofix::Fix;
-use crate::autofix::Patch;
+use crate::autofix::{Fix, Patch};
 use crate::checks::Check;

+// TODO(charlie): The model here is awkward because `Apply` is only relevant at
+// higher levels in the execution flow.
 #[derive(Hash)]
 pub enum Mode {
    Generate,
@@ -55,33 +56,33 @@ fn apply_fixes<'a>(fixes: impl Iterator<Item = &'a mut Fix>, contents: &str) ->
    let mut applied: BTreeSet<&Patch> = Default::default();

    for fix in fixes.sorted_by_key(|fix| fix.patch.location) {
-        // If we already applied an identical fix as part of another correction, skip any
-        // re-application.
+        // If we already applied an identical fix as part of another correction, skip
+        // any re-application.
        if applied.contains(&fix.patch) {
            fix.applied = true;
            continue;
        }

-        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
+        // Best-effort approach: if this fix overlaps with a fix we've already applied,
+        // skip it.
        if last_pos > fix.patch.location {
            continue;
        }

        if fix.patch.location.row() > last_pos.row() {
            if last_pos.row() > 0 || last_pos.column() > 0 {
-                output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
+                output.push_str(&lines[last_pos.row() - 1][last_pos.column()..]);
                output.push('\n');
            }
            for line in &lines[last_pos.row()..fix.patch.location.row() - 1] {
                output.push_str(line);
                output.push('\n');
            }
-            output
-                .push_str(&lines[fix.patch.location.row() - 1][..fix.patch.location.column() - 1]);
+            output.push_str(&lines[fix.patch.location.row() - 1][..fix.patch.location.column()]);
            output.push_str(&fix.patch.content);
        } else {
            output.push_str(
-                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.patch.location.column() - 1],
+                &lines[last_pos.row() - 1][last_pos.column()..fix.patch.location.column()],
            );
            output.push_str(&fix.patch.content);
        }
@@ -95,7 +96,7 @@ fn apply_fixes<'a>(fixes: impl Iterator<Item = &'a mut Fix>, contents: &str) ->
        && (last_pos.row() - 1) < lines.len()
        && (last_pos.row() > 0 || last_pos.column() > 0)
    {
-        output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
+        output.push_str(&lines[last_pos.row() - 1][last_pos.column()..]);
        output.push('\n');
    }
    if last_pos.row() < lines.len() {
@@ -114,8 +115,7 @@ mod tests {
    use rustpython_parser::ast::Location;

    use crate::autofix::fixer::apply_fixes;
-    use crate::autofix::Fix;
-    use crate::autofix::Patch;
+    use crate::autofix::{Fix, Patch};

    #[test]
    fn empty_file() -> Result<()> {
@@ -133,8 +133,8 @@ mod tests {
        let mut fixes = vec![Fix {
            patch: Patch {
                content: "Bar".to_string(),
-                location: Location::new(1, 9),
-                end_location: Location::new(1, 15),
+                location: Location::new(1, 8),
+                end_location: Location::new(1, 14),
            },
            applied: false,
        }];
@@ -159,8 +159,8 @@ mod tests {
        let mut fixes = vec![Fix {
            patch: Patch {
                content: "".to_string(),
-                location: Location::new(1, 8),
-                end_location: Location::new(1, 16),
+                location: Location::new(1, 7),
+                end_location: Location::new(1, 15),
            },
            applied: false,
        }];
@@ -186,16 +186,16 @@ mod tests {
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 8),
-                    end_location: Location::new(1, 17),
+                    location: Location::new(1, 7),
+                    end_location: Location::new(1, 16),
                },
                applied: false,
            },
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 17),
-                    end_location: Location::new(1, 24),
+                    location: Location::new(1, 16),
+                    end_location: Location::new(1, 23),
                },
                applied: false,
            },
@@ -222,16 +222,16 @@ mod tests {
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 8),
-                    end_location: Location::new(1, 16),
+                    location: Location::new(1, 7),
+                    end_location: Location::new(1, 15),
                },
                applied: false,
            },
            Fix {
                patch: Patch {
                    content: "ignored".to_string(),
-                    location: Location::new(1, 10),
-                    end_location: Location::new(1, 12),
+                    location: Location::new(1, 9),
+                    end_location: Location::new(1, 11),
                },
                applied: false,
            },
--- a/src/autofix/helpers.rs
+++ b/src/autofix/helpers.rs
@@ -4,7 +4,8 @@ use rustpython_parser::ast::{ExcepthandlerKind, Location, Stmt, StmtKind};

 use crate::autofix::Fix;

-/// Determine if a body contains only a single statement, taking into account deleted.
+/// Determine if a body contains only a single statement, taking into account
+/// deleted.
 fn has_single_child(body: &[Stmt], deleted: &[&Stmt]) -> bool {
    body.iter().filter(|child| !deleted.contains(child)).count() == 1
 }
@@ -80,10 +81,11 @@ pub fn remove_stmt(stmt: &Stmt, parent: Option<&Stmt>, deleted: &[&Stmt]) -> Res
        ))
    } else {
        // Otherwise, nuke the entire line.
-        // TODO(charlie): This logic assumes that there are no multi-statement physical lines.
+        // TODO(charlie): This logic assumes that there are no multi-statement physical
+        // lines.
        Ok(Fix::deletion(
-            Location::new(stmt.location.row(), 1),
-            Location::new(stmt.end_location.unwrap().row() + 1, 1),
+            Location::new(stmt.location.row(), 0),
+            Location::new(stmt.end_location.unwrap().row() + 1, 0),
        ))
    }
 }
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,4 +1,5 @@
-// cacache uses asyncd-std which has no wasm support, so currently no caching support on wasm
+// cacache uses asyncd-std which has no wasm support, so currently no caching
+// support on wasm
 #![cfg_attr(
    target_family = "wasm",
    allow(unused_imports, unused_variables, dead_code)
@@ -127,7 +128,7 @@ pub fn get(
            }
            Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
        },
-        Err(EntryNotFound(_, _)) => {}
+        Err(EntryNotFound(..)) => {}
        Err(e) => error!("Failed to read from cache: {e:?}"),
    }
    None
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -5,15 +5,14 @@ use std::ops::Deref;
 use std::path::Path;

 use log::error;
-use once_cell::unsync::OnceCell;
 use rustpython_parser::ast::{
    Arg, Arguments, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprContext, ExprKind,
    KeywordData, Operator, Stmt, StmtKind, Suite,
 };
 use rustpython_parser::parser;

-use crate::ast::helpers::{extract_handler_names, match_name_or_attr, SubscriptKind};
-use crate::ast::operations::{extract_all_names, SourceCodeLocator};
+use crate::ast::helpers::{extract_handler_names, match_name_or_attr_from_module};
+use crate::ast::operations::extract_all_names;
 use crate::ast::relocate::relocate_expr;
 use crate::ast::types::{
    Binding, BindingContext, BindingKind, CheckLocator, FunctionScope, ImportKind, Range, Scope,
@@ -26,25 +25,38 @@ use crate::checks::{Check, CheckCode, CheckKind};
 use crate::docstrings::definition::{Definition, DefinitionKind, Documentable};
 use crate::python::builtins::{BUILTINS, MAGIC_GLOBALS};
 use crate::python::future::ALL_FEATURE_NAMES;
-use crate::settings::{PythonVersion, Settings};
+use crate::python::typing;
+use crate::python::typing::SubscriptKind;
+use crate::settings::types::PythonVersion;
+use crate::settings::Settings;
+use crate::source_code_locator::SourceCodeLocator;
 use crate::visibility::{module_visibility, transition_scope, Modifier, Visibility, VisibleScope};
 use crate::{
    docstrings, flake8_bugbear, flake8_builtins, flake8_comprehensions, flake8_print, pep8_naming,
    pycodestyle, pydocstyle, pyflakes, pyupgrade,
 };

-pub const GLOBAL_SCOPE_INDEX: usize = 0;
+const GLOBAL_SCOPE_INDEX: usize = 0;
+const TRACK_FROM_IMPORTS: [&str; 9] = [
+    "collections",
+    "collections.abc",
+    "contextlib",
+    "re",
+    "typing",
+    "typing.io",
+    "typing.re",
+    "typing_extensions",
+    "weakref",
+];

 pub struct Checker<'a> {
    // Input data.
    path: &'a Path,
-    content: &'a str,
    autofix: &'a fixer::Mode,
    pub(crate) settings: &'a Settings,
+    pub(crate) locator: &'a SourceCodeLocator<'a>,
    // Computed checks.
    checks: Vec<Check>,
-    // Efficient source-code slicing.
-    locator: OnceCell<SourceCodeLocator<'a>>,
    // Docstring tracking.
    docstrings: Vec<(Definition<'a>, Visibility)>,
    // Edit tracking.
@@ -71,6 +83,7 @@ pub struct Checker<'a> {
    futures_allowed: bool,
    annotations_future_enabled: bool,
    except_handlers: Vec<Vec<String>>,
+    from_imports: BTreeMap<&'a str, BTreeSet<&'a str>>,
 }

 impl<'a> Checker<'a> {
@@ -78,14 +91,13 @@ impl<'a> Checker<'a> {
        settings: &'a Settings,
        autofix: &'a fixer::Mode,
        path: &'a Path,
-        content: &'a str,
+        locator: &'a SourceCodeLocator,
    ) -> Checker<'a> {
        Checker {
            settings,
            autofix,
            path,
-            content,
-            locator: OnceCell::new(),
+            locator,
            checks: Default::default(),
            docstrings: Default::default(),
            deletions: Default::default(),
@@ -103,25 +115,35 @@ impl<'a> Checker<'a> {
                modifier: Modifier::Module,
                visibility: module_visibility(path),
            },
-            in_f_string: None,
+            in_f_string: Default::default(),
            in_annotation: Default::default(),
            in_literal: Default::default(),
            seen_import_boundary: Default::default(),
            futures_allowed: true,
            annotations_future_enabled: Default::default(),
            except_handlers: Default::default(),
+            from_imports: Default::default(),
        }
    }

-    /// Get access to a lazily-initialized `SourceCodeLocator` for the file contents.
-    pub fn get_locator(&self) -> &SourceCodeLocator {
-        self.locator
-            .get_or_init(|| SourceCodeLocator::new(self.content))
+    /// Return `true` if a patch should be generated under the given autofix
+    /// `Mode`.
+    pub fn patch(&self) -> bool {
+        // TODO(charlie): We can't fix errors in f-strings until RustPython adds
+        // location data.
+        self.autofix.patch() && self.in_f_string.is_none()
    }

-    /// Return `true` if a patch should be generated under the given autofix `Mode`.
-    pub fn patch(&self) -> bool {
-        self.autofix.patch()
+    /// Return `true` if the `Expr` is a reference to `typing.${target}`.
+    pub fn match_typing_module(&self, expr: &Expr, target: &str) -> bool {
+        match_name_or_attr_from_module(expr, target, "typing", self.from_imports.get("typing"))
+            || (typing::in_extensions(target)
+                && match_name_or_attr_from_module(
+                    expr,
+                    target,
+                    "typing_extensions",
+                    self.from_imports.get("typing_extensions"),
+                ))
    }
 }

@@ -235,7 +257,11 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::N802) {
-                    if let Some(check) = pep8_naming::checks::invalid_function_name(stmt, name) {
+                    if let Some(check) = pep8_naming::checks::invalid_function_name(
+                        stmt,
+                        name,
+                        &self.settings.pep8_naming,
+                    ) {
                        self.checks.push(check);
                    }
                }
@@ -246,6 +272,7 @@ where
                            self.current_scope(),
                            decorator_list,
                            args,
+                            &self.settings.pep8_naming,
                        )
                    {
                        self.checks.push(check);
@@ -257,6 +284,7 @@ where
                        self.current_scope(),
                        decorator_list,
                        args,
+                        &self.settings.pep8_naming,
                    ) {
                        self.checks.push(check);
                    }
@@ -272,7 +300,8 @@ where

                self.check_builtin_shadowing(name, Range::from_located(stmt), true);

-                // Visit the decorators and arguments, but avoid the body, which will be deferred.
+                // Visit the decorators and arguments, but avoid the body, which will be
+                // deferred.
                for expr in decorator_list {
                    self.visit_expr(expr);
                }
@@ -362,6 +391,14 @@ where
                    }
                }

+                if self.settings.enabled.contains(&CheckCode::N818) {
+                    if let Some(check) =
+                        pep8_naming::checks::error_suffix_on_exception_name(stmt, bases, name)
+                    {
+                        self.checks.push(check);
+                    }
+                }
+
                self.check_builtin_shadowing(
                    name,
                    self.locate_check(Range::from_located(stmt)),
@@ -381,7 +418,7 @@ where
            }
            StmtKind::Import { names } => {
                if self.settings.enabled.contains(&CheckCode::E402) {
-                    if self.seen_import_boundary && stmt.location.column() == 1 {
+                    if self.seen_import_boundary && stmt.location.column() == 0 {
                        self.checks.push(Check::new(
                            CheckKind::ModuleImportNotAtTopOfFile,
                            self.locate_check(Range::from_located(stmt)),
@@ -486,8 +523,26 @@ where
                module,
                level,
            } => {
+                // Track `import from` statements, to ensure that we can correctly attribute
+                // references like `from typing import Union`.
+                if level.map(|level| level == 0).unwrap_or(true) {
+                    if let Some(module) = module {
+                        if TRACK_FROM_IMPORTS.contains(&module.as_str()) {
+                            self.from_imports
+                                .entry(module)
+                                .or_insert_with(BTreeSet::new)
+                                .extend(
+                                    names
+                                        .iter()
+                                        .filter(|alias| alias.node.asname.is_none())
+                                        .map(|alias| alias.node.name.as_str()),
+                                )
+                        }
+                    }
+                }
+
                if self.settings.enabled.contains(&CheckCode::E402) {
-                    if self.seen_import_boundary && stmt.location.column() == 1 {
+                    if self.seen_import_boundary && stmt.location.column() == 0 {
                        self.checks.push(Check::new(
                            CheckKind::ModuleImportNotAtTopOfFile,
                            self.locate_check(Range::from_located(stmt)),
@@ -705,6 +760,9 @@ where
                {
                    flake8_bugbear::plugins::duplicate_exceptions(self, stmt, handlers);
                }
+                if self.settings.enabled.contains(&CheckCode::B013) {
+                    flake8_bugbear::plugins::redundant_tuple_in_exception_handler(self, handlers);
+                }
            }
            StmtKind::Assign { targets, value, .. } => {
                if self.settings.enabled.contains(&CheckCode::E731) {
@@ -852,7 +910,7 @@ where
                    pyupgrade::plugins::use_pep604_annotation(self, expr, value, slice);
                }

-                if match_name_or_attr(value, "Literal") {
+                if self.match_typing_module(value, "Literal") {
                    self.in_literal = true;
                }
            }
@@ -877,6 +935,7 @@ where
                    // Ex) List[...]
                    if self.settings.enabled.contains(&CheckCode::U006)
                        && self.settings.target_version >= PythonVersion::Py39
+                        && typing::is_pep585_builtin(expr, self.from_imports.get("typing"))
                    {
                        pyupgrade::plugins::use_pep585_annotation(self, expr, id);
                    }
@@ -899,23 +958,19 @@ where
                }
                ExprContext::Del => self.handle_node_delete(expr),
            },
-            ExprKind::Attribute { value, attr, .. } => {
+            ExprKind::Attribute { attr, .. } => {
                // Ex) typing.List[...]
                if self.settings.enabled.contains(&CheckCode::U006)
                    && self.settings.target_version >= PythonVersion::Py39
+                    && typing::is_pep585_builtin(expr, self.from_imports.get("typing"))
                {
-                    if let ExprKind::Name { id, .. } = &value.node {
-                        if id == "typing" {
-                            pyupgrade::plugins::use_pep585_annotation(self, expr, attr);
-                        }
-                    }
+                    pyupgrade::plugins::use_pep585_annotation(self, expr, attr);
                }
            }
            ExprKind::Call {
                func,
                args,
                keywords,
-                ..
            } => {
                if self.settings.enabled.contains(&CheckCode::U005) {
                    pyupgrade::plugins::deprecated_unittest_alias(self, func);
@@ -935,25 +990,43 @@ where

                // flake8-comprehensions
                if self.settings.enabled.contains(&CheckCode::C400) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_list(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_list(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C401) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_set(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_set(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C402) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_dict(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_dict(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -961,7 +1034,13 @@ where
                if self.settings.enabled.contains(&CheckCode::C403) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_list_comprehension_set(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            keywords,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -971,7 +1050,10 @@ where
                if self.settings.enabled.contains(&CheckCode::C404) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_list_comprehension_dict(
-                            expr, func, args,
+                            func,
+                            args,
+                            keywords,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -979,24 +1061,39 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C405) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_literal_set(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_literal_set(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C406) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_literal_dict(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_literal_dict(
+                        func,
+                        args,
+                        keywords,
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C408) {
                    if let Some(check) = flake8_comprehensions::checks::unnecessary_collection_call(
-                        expr, func, args, keywords,
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
                    ) {
                        self.checks.push(check);
                    };
@@ -1005,7 +1102,12 @@ where
                if self.settings.enabled.contains(&CheckCode::C409) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_literal_within_tuple_call(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -1015,7 +1117,12 @@ where
                if self.settings.enabled.contains(&CheckCode::C410) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_literal_within_list_call(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -1023,9 +1130,14 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C411) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_list_call(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_list_call(
+                        expr,
+                        func,
+                        args,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -1033,7 +1145,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C413) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_call_around_sorted(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -1043,7 +1157,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C414) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_double_cast_or_process(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -1053,7 +1169,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C415) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_subscript_reversal(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -1061,9 +1179,11 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C417) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_map(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_map(
+                        func,
+                        args,
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -1240,7 +1360,10 @@ where
            ExprKind::ListComp { elt, generators } | ExprKind::SetComp { elt, generators } => {
                if self.settings.enabled.contains(&CheckCode::C416) {
                    if let Some(check) = flake8_comprehensions::checks::unnecessary_comprehension(
-                        expr, elt, generators,
+                        expr,
+                        elt,
+                        generators,
+                        self.locate_check(Range::from_located(expr)),
                    ) {
                        self.checks.push(check);
                    };
@@ -1268,12 +1391,12 @@ where
                args,
                keywords,
            } => {
-                if match_name_or_attr(func, "ForwardRef") {
+                if self.match_typing_module(func, "ForwardRef") {
                    self.visit_expr(func);
                    for expr in args {
                        self.visit_annotation(expr);
                    }
-                } else if match_name_or_attr(func, "cast") {
+                } else if self.match_typing_module(func, "cast") {
                    self.visit_expr(func);
                    if !args.is_empty() {
                        self.visit_annotation(&args[0]);
@@ -1281,12 +1404,12 @@ where
                    for expr in args.iter().skip(1) {
                        self.visit_expr(expr);
                    }
-                } else if match_name_or_attr(func, "NewType") {
+                } else if self.match_typing_module(func, "NewType") {
                    self.visit_expr(func);
                    for expr in args.iter().skip(1) {
                        self.visit_annotation(expr);
                    }
-                } else if match_name_or_attr(func, "TypeVar") {
+                } else if self.match_typing_module(func, "TypeVar") {
                    self.visit_expr(func);
                    for expr in args.iter().skip(1) {
                        self.visit_annotation(expr);
@@ -1303,7 +1426,7 @@ where
                            }
                        }
                    }
-                } else if match_name_or_attr(func, "NamedTuple") {
+                } else if self.match_typing_module(func, "NamedTuple") {
                    self.visit_expr(func);

                    // Ex) NamedTuple("a", [("a", int)])
@@ -1335,7 +1458,7 @@ where
                        let KeywordData { value, .. } = &keyword.node;
                        self.visit_annotation(value);
                    }
-                } else if match_name_or_attr(func, "TypedDict") {
+                } else if self.match_typing_module(func, "TypedDict") {
                    self.visit_expr(func);

                    // Ex) TypedDict("a", {"a": int})
@@ -1362,7 +1485,7 @@ where
                }
            }
            ExprKind::Subscript { value, slice, ctx } => {
-                match helpers::match_annotated_subscript(value) {
+                match typing::match_annotated_subscript(value, &self.from_imports) {
                    Some(subscript) => match subscript {
                        // Ex) Optional[int]
                        SubscriptKind::AnnotatedSubscript => {
@@ -1495,8 +1618,12 @@ where
            self.checks
                .extend(pyflakes::checks::duplicate_arguments(arguments));
        }
+        if self.settings.enabled.contains(&CheckCode::B006) {
+            flake8_bugbear::plugins::mutable_argument_default(self, arguments)
+        }

-        // Bind, but intentionally avoid walking default expressions, as we handle them upstream.
+        // Bind, but intentionally avoid walking default expressions, as we handle them
+        // upstream.
        for arg in &arguments.posonlyargs {
            self.visit_arg(arg);
        }
@@ -1515,7 +1642,8 @@ where
    }

    fn visit_arg(&mut self, arg: &'b Arg) {
-        // Bind, but intentionally avoid walking the annotation, as we handle it upstream.
+        // Bind, but intentionally avoid walking the annotation, as we handle it
+        // upstream.
        self.add_binding(
            arg.node.arg.to_string(),
            Binding {
@@ -1557,8 +1685,9 @@ fn try_mark_used(scope: &mut Scope, scope_id: usize, id: &str, expr: &Expr) -> b
        // Mark the binding as used.
        binding.used = Some((scope_id, Range::from_located(expr)));

-        // If the name of the sub-importation is the same as an alias of another importation and the
-        // alias is used, that sub-importation should be marked as used too.
+        // If the name of the sub-importation is the same as an alias of another
+        // importation and the alias is used, that sub-importation should be
+        // marked as used too.
        //
        // This handles code like:
        //   import pyarrow as pa
@@ -1668,7 +1797,8 @@ impl<'a> Checker<'a> {
    fn add_binding(&mut self, name: String, binding: Binding) {
        let scope = &mut self.scopes[*(self.scope_stack.last().expect("No current scope found."))];

-        // TODO(charlie): Don't treat annotations as assignments if there is an existing value.
+        // TODO(charlie): Don't treat annotations as assignments if there is an existing
+        // value.
        let binding = match scope.values.get(&name) {
            None => binding,
            Some(existing) => {
@@ -1798,6 +1928,30 @@ impl<'a> Checker<'a> {
                }
            }

+            if self.settings.enabled.contains(&CheckCode::N806) {
+                if let Some(check) =
+                    pep8_naming::checks::non_lowercase_variable_in_function(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
+            if self.settings.enabled.contains(&CheckCode::N815) {
+                if let Some(check) =
+                    pep8_naming::checks::mixed_case_variable_in_class_scope(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
+            if self.settings.enabled.contains(&CheckCode::N816) {
+                if let Some(check) =
+                    pep8_naming::checks::mixed_case_variable_in_global_scope(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
            if matches!(parent.node, StmtKind::AnnAssign { value: None, .. }) {
                self.add_binding(
                    id.to_string(),
@@ -2104,7 +2258,7 @@ impl<'a> Checker<'a> {
                            ImportKind::ImportFrom => pyflakes::fixes::remove_unused_import_froms,
                        };

-                        match removal_fn(self.get_locator(), &full_names, child, parent, &deleted) {
+                        match removal_fn(self.locator, &full_names, child, parent, &deleted) {
                            Ok(fix) => Some(fix),
                            Err(e) => {
                                error!("Failed to fix unused imports: {}", e);
@@ -2115,15 +2269,27 @@ impl<'a> Checker<'a> {
                        None
                    };

-                    let mut check = Check::new(
-                        CheckKind::UnusedImport(full_names.into_iter().map(String::from).collect()),
-                        self.locate_check(Range::from_located(child)),
-                    );
-                    if let Some(fix) = fix {
-                        check.amend(fix);
+                    if self.path.ends_with("__init__.py") {
+                        self.checks.push(Check::new(
+                            CheckKind::UnusedImport(
+                                full_names.into_iter().map(String::from).collect(),
+                                true,
+                            ),
+                            self.locate_check(Range::from_located(child)),
+                        ));
+                    } else {
+                        let mut check = Check::new(
+                            CheckKind::UnusedImport(
+                                full_names.into_iter().map(String::from).collect(),
+                                false,
+                            ),
+                            self.locate_check(Range::from_located(child)),
+                        );
+                        if let Some(fix) = fix {
+                            check.amend(fix);
+                        }
+                        self.checks.push(check);
                    }
-
-                    self.checks.push(check);
                }
            }
        }
@@ -2252,12 +2418,12 @@ impl<'a> Checker<'a> {

 pub fn check_ast(
    python_ast: &Suite,
-    contents: &str,
+    locator: &SourceCodeLocator,
    settings: &Settings,
    autofix: &fixer::Mode,
    path: &Path,
 ) -> Vec<Check> {
-    let mut checker = Checker::new(settings, autofix, path, contents);
+    let mut checker = Checker::new(settings, autofix, path, locator);
    checker.push_scope(Scope::new(ScopeKind::Module));
    checker.bind_builtins();

--- a/src/check_lines.rs
+++ b/src/check_lines.rs
@@ -5,8 +5,7 @@ use std::collections::BTreeMap;
 use rustpython_parser::ast::Location;

 use crate::ast::types::Range;
-use crate::autofix::fixer;
-use crate::autofix::Fix;
+use crate::autofix::{fixer, Fix};
 use crate::checks::{Check, CheckCode, CheckKind};
 use crate::noqa;
 use crate::noqa::Directive;
@@ -68,7 +67,7 @@ pub fn check_lines(
                    .or_insert_with(|| (noqa::extract_noqa_directive(lines[noqa_lineno]), vec![]));

                match noqa {
-                    (Directive::All(_, _), matches) => {
+                    (Directive::All(..), matches) => {
                        matches.push(check.kind.code().as_ref());
                        ignored.push(index)
                    }
@@ -94,13 +93,13 @@ pub fn check_lines(
                let check = Check::new(
                    CheckKind::LineTooLong(line_length, settings.line_length),
                    Range {
-                        location: Location::new(lineno + 1, 1),
-                        end_location: Location::new(lineno + 1, line_length + 1),
+                        location: Location::new(lineno + 1, 0),
+                        end_location: Location::new(lineno + 1, line_length),
                    },
                );

                match noqa {
-                    (Directive::All(_, _), matches) => {
+                    (Directive::All(..), matches) => {
                        matches.push(check.kind.code().as_ref());
                    }
                    (Directive::Codes(_, _, codes), matches) => {
@@ -118,8 +117,8 @@ pub fn check_lines(

    // Enforce newlines at end of files.
    if settings.enabled.contains(&CheckCode::W292) && !contents.ends_with('\n') {
-        // Note: if `lines.last()` is `None`, then `contents` is empty (and so we don't want to
-        // raise W292 anyway).
+        // Note: if `lines.last()` is `None`, then `contents` is empty (and so we don't
+        // want to raise W292 anyway).
        if let Some(line) = lines.last() {
            let lineno = lines.len() - 1;
            let noqa_lineno = noqa_line_for
@@ -140,7 +139,7 @@ pub fn check_lines(
            );

            match noqa {
-                (Directive::All(_, _), matches) => {
+                (Directive::All(..), matches) => {
                    matches.push(check.kind.code().as_ref());
                }
                (Directive::Codes(_, _, codes), matches) => {
@@ -164,14 +163,14 @@ pub fn check_lines(
                        let mut check = Check::new(
                            CheckKind::UnusedNOQA(None),
                            Range {
-                                location: Location::new(row + 1, start + 1),
-                                end_location: Location::new(row + 1, end + 1),
+                                location: Location::new(row + 1, start),
+                                end_location: Location::new(row + 1, end),
                            },
                        );
                        if autofix.patch() {
                            check.amend(Fix::deletion(
-                                Location::new(row + 1, start + 1),
-                                Location::new(row + 1, lines[row].chars().count() + 1),
+                                Location::new(row + 1, start),
+                                Location::new(row + 1, lines[row].chars().count()),
                            ));
                        }
                        line_checks.push(check);
@@ -192,21 +191,21 @@ pub fn check_lines(
                        let mut check = Check::new(
                            CheckKind::UnusedNOQA(Some(invalid_codes)),
                            Range {
-                                location: Location::new(row + 1, start + 1),
-                                end_location: Location::new(row + 1, end + 1),
+                                location: Location::new(row + 1, start),
+                                end_location: Location::new(row + 1, end),
                            },
                        );
                        if autofix.patch() {
                            if valid_codes.is_empty() {
                                check.amend(Fix::deletion(
-                                    Location::new(row + 1, start + 1),
-                                    Location::new(row + 1, lines[row].chars().count() + 1),
+                                    Location::new(row + 1, start),
+                                    Location::new(row + 1, lines[row].chars().count()),
                                ));
                            } else {
                                check.amend(Fix::replacement(
                                    format!("  # noqa: {}", valid_codes.join(", ")),
-                                    Location::new(row + 1, start + 1),
-                                    Location::new(row + 1, lines[row].chars().count() + 1),
+                                    Location::new(row + 1, start),
+                                    Location::new(row + 1, lines[row].chars().count()),
                                ));
                            }
                        }
@@ -227,11 +226,10 @@ pub fn check_lines(

 #[cfg(test)]
 mod tests {
+    use super::check_lines;
    use crate::autofix::fixer;
    use crate::checks::{Check, CheckCode};
-    use crate::settings;
-
-    use super::check_lines;
+    use crate::settings::Settings;

    #[test]
    fn e501_non_ascii_char() {
@@ -243,9 +241,9 @@ mod tests {
                &mut checks,
                line,
                &noqa_line_for,
-                &settings::Settings {
+                &Settings {
                    line_length,
-                    ..settings::Settings::for_rule(CheckCode::E501)
+                    ..Settings::for_rule(CheckCode::E501)
                },
                &fixer::Mode::Generate,
            );
--- a/src/check_tokens.rs
+++ b/src/check_tokens.rs
@@ -1,123 +1,50 @@
 //! Lint rules based on token traversal.

-use rustpython_ast::Location;
 use rustpython_parser::lexer::{LexResult, Tok};

-use crate::ast::operations::SourceCodeLocator;
-use crate::ast::types::Range;
-use crate::checks::{Check, CheckCode, CheckKind};
-use crate::Settings;
-
-// See: https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals
-const VALID_ESCAPE_SEQUENCES: &[char; 23] = &[
-    '\n', '\\', '\'', '"', 'a', 'b', 'f', 'n', 'r', 't', 'v', '0', '1', '2', '3', '4', '5', '6',
-    '7', 'x', // Escape sequences only recognized in string literals
-    'N', 'u', 'U',
-];
-
-/// Return the quotation markers used for a String token.
-fn extract_quote(text: &str) -> &str {
-    if text.len() >= 3 {
-        let triple = &text[text.len() - 3..];
-        if triple == "'''" || triple == "\"\"\"" {
-            return triple;
-        }
-    }
-
-    if !text.is_empty() {
-        let single = &text[text.len() - 1..];
-        if single == "'" || single == "\"" {
-            return single;
-        }
-    }
-
-    panic!("Unable to find quotation mark for String token.")
-}
-
-/// W605
-fn invalid_escape_sequence(
-    locator: &SourceCodeLocator,
-    start: &Location,
-    end: &Location,
-) -> Vec<Check> {
-    let mut checks = vec![];
-
-    let text = locator.slice_source_code_range(&Range {
-        location: *start,
-        end_location: *end,
-    });
-
-    // Determine whether the string is single- or triple-quoted.
-    let quote = extract_quote(text);
-    let quote_pos = text.find(quote).unwrap();
-    let prefix = text[..quote_pos].to_lowercase();
-    let body = &text[(quote_pos + quote.len())..(text.len() - quote.len())];
-
-    if !prefix.contains('r') {
-        let mut col_offset = 0;
-        let mut row_offset = 0;
-        let mut in_escape = false;
-        let mut chars = body.chars();
-        let mut current = chars.next();
-        let mut next = chars.next();
-        while let (Some(current_char), Some(next_char)) = (current, next) {
-            // If we see an escaped backslash, avoid treating the character _after_ the
-            // escaped backslash as itself an escaped character.
-            if in_escape {
-                in_escape = false;
-            } else {
-                in_escape = current_char == '\\' && next_char == '\\';
-                if current_char == '\\' && !VALID_ESCAPE_SEQUENCES.contains(&next_char) {
-                    // Compute the location of the escape sequence by offsetting the location of the
-                    // string token by the characters we've seen thus far.
-                    let location = if row_offset == 0 {
-                        Location::new(
-                            start.row() + row_offset,
-                            start.column() + prefix.len() + quote.len() + col_offset,
-                        )
-                    } else {
-                        Location::new(start.row() + row_offset, col_offset + 1)
-                    };
-                    let end_location = Location::new(location.row(), location.column() + 1);
-                    checks.push(Check::new(
-                        CheckKind::InvalidEscapeSequence(next_char),
-                        Range {
-                            location,
-                            end_location,
-                        },
-                    ))
-                }
-            }
-
-            // Track the offset from the start position as we iterate over the body.
-            if current_char == '\n' {
-                col_offset = 0;
-                row_offset += 1;
-            } else {
-                col_offset += 1;
-            }
-
-            current = next;
-            next = chars.next();
-        }
-    }
-
-    checks
-}
+use crate::checks::{Check, CheckCode};
+use crate::flake8_quotes::docstring_detection::StateMachine;
+use crate::source_code_locator::SourceCodeLocator;
+use crate::{flake8_quotes, pycodestyle, Settings};

 pub fn check_tokens(
    checks: &mut Vec<Check>,
-    contents: &str,
+    locator: &SourceCodeLocator,
    tokens: &[LexResult],
    settings: &Settings,
 ) {
-    // TODO(charlie): Use a shared SourceCodeLocator between this site and the AST traversal.
-    let locator = SourceCodeLocator::new(contents);
    let enforce_invalid_escape_sequence = settings.enabled.contains(&CheckCode::W605);
+    let enforce_quotes = settings.enabled.contains(&CheckCode::Q000)
+        | settings.enabled.contains(&CheckCode::Q001)
+        | settings.enabled.contains(&CheckCode::Q002)
+        | settings.enabled.contains(&CheckCode::Q003);
+
+    let mut state_machine: StateMachine = Default::default();
    for (start, tok, end) in tokens.iter().flatten() {
+        // W605
        if enforce_invalid_escape_sequence {
            if matches!(tok, Tok::String { .. }) {
-                checks.extend(invalid_escape_sequence(&locator, start, end));
+                checks.extend(pycodestyle::checks::invalid_escape_sequence(
+                    locator, start, end,
+                ));
+            }
+        }
+
+        // flake8-quotes
+        if enforce_quotes {
+            let is_docstring = state_machine.consume(tok);
+            if matches!(tok, Tok::String { .. }) {
+                if let Some(check) = flake8_quotes::checks::quotes(
+                    locator,
+                    start,
+                    end,
+                    is_docstring,
+                    &settings.flake8_quotes,
+                ) {
+                    if settings.enabled.contains(check.kind.code()) {
+                        checks.push(check);
+                    }
+                }
            }
        }
    }
--- a/src/checks.rs
+++ b/src/checks.rs
@@ -7,6 +7,7 @@ use strum_macros::{AsRefStr, EnumIter, EnumString};

 use crate::ast::types::Range;
 use crate::autofix::Fix;
+use crate::flake8_quotes::settings::Quote;
 use crate::pyupgrade::types::Primitive;

 #[derive(
@@ -77,8 +78,10 @@ pub enum CheckCode {
    A003,
    // flake8-bugbear
    B002,
+    B006,
    B007,
    B011,
+    B013,
    B014,
    B017,
    B025,
@@ -102,6 +105,11 @@ pub enum CheckCode {
    // flake8-print
    T201,
    T203,
+    // flake8-quotes
+    Q000,
+    Q001,
+    Q002,
+    Q003,
    // pyupgrade
    U001,
    U002,
@@ -162,12 +170,16 @@ pub enum CheckCode {
    N803,
    N804,
    N805,
+    N806,
    N807,
    N811,
    N812,
    N813,
    N814,
+    N815,
+    N816,
    N817,
+    N818,
    // Meta
    M001,
 }
@@ -184,6 +196,7 @@ pub enum CheckCategory {
    Flake8Bugbear,
    Flake8Builtins,
    Flake8Print,
+    Flake8Quotes,
    Meta,
 }

@@ -197,6 +210,7 @@ impl CheckCategory {
            CheckCategory::Flake8Bugbear => "flake8-bugbear",
            CheckCategory::Flake8Comprehensions => "flake8-comprehensions",
            CheckCategory::Flake8Print => "flake8-print",
+            CheckCategory::Flake8Quotes => "flake8-quotes",
            CheckCategory::Pyupgrade => "pyupgrade",
            CheckCategory::Pydocstyle => "pydocstyle",
            CheckCategory::PEP8Naming => "pep8-naming",
@@ -265,7 +279,7 @@ pub enum CheckKind {
    UndefinedExport(String),
    UndefinedLocal(String),
    UndefinedName(String),
-    UnusedImport(Vec<String>),
+    UnusedImport(Vec<String>, bool),
    UnusedVariable(String),
    YieldOutsideFunction,
    // flake8-builtins
@@ -274,8 +288,10 @@ pub enum CheckKind {
    BuiltinAttributeShadowing(String),
    // flake8-bugbear
    UnaryPrefixIncrement,
+    MutableArgumentDefault,
    UnusedLoopControlVariable(String),
    DoNotAssertFalse,
+    RedundantTupleInExceptionHandler(String),
    DuplicateHandlerException(Vec<String>),
    NoAssertRaisesException,
    DuplicateTryBlockException(String),
@@ -299,6 +315,11 @@ pub enum CheckKind {
    // flake8-print
    PrintFound,
    PPrintFound,
+    // flake8-quotes
+    BadQuotesInlineString(Quote),
+    BadQuotesMultilineString(Quote),
+    BadQuotesDocstring(Quote),
+    AvoidQuoteEscape,
    // pyupgrade
    TypeOfPrimitive(Primitive),
    UnnecessaryAbspath,
@@ -359,22 +380,31 @@ pub enum CheckKind {
    InvalidArgumentName(String),
    InvalidFirstArgumentNameForClassMethod,
    InvalidFirstArgumentNameForMethod,
+    NonLowercaseVariableInFunction(String),
    DunderFunctionName,
    ConstantImportedAsNonConstant(String, String),
    LowercaseImportedAsNonLowercase(String, String),
    CamelcaseImportedAsLowercase(String, String),
    CamelcaseImportedAsConstant(String, String),
+    MixedCaseVariableInClassScope(String),
+    MixedCaseVariableInGlobalScope(String),
    CamelcaseImportedAsAcronym(String, String),
+    ErrorSuffixOnExceptionName(String),
    // Meta
    UnusedNOQA(Option<Vec<String>>),
 }

 impl CheckCode {
-    /// The source for the check (either the AST, the filesystem, or the physical lines).
+    /// The source for the check (either the AST, the filesystem, or the
+    /// physical lines).
    pub fn lint_source(&self) -> &'static LintSource {
        match self {
            CheckCode::E501 | CheckCode::W292 | CheckCode::M001 => &LintSource::Lines,
-            CheckCode::W605 => &LintSource::Tokens,
+            CheckCode::W605
+            | CheckCode::Q000
+            | CheckCode::Q001
+            | CheckCode::Q002
+            | CheckCode::Q003 => &LintSource::Tokens,
            CheckCode::E902 => &LintSource::FileSystem,
            _ => &LintSource::AST,
        }
@@ -402,7 +432,7 @@ impl CheckCode {
            CheckCode::W292 => CheckKind::NoNewLineAtEndOfFile,
            CheckCode::W605 => CheckKind::InvalidEscapeSequence('c'),
            // pyflakes
-            CheckCode::F401 => CheckKind::UnusedImport(vec!["...".to_string()]),
+            CheckCode::F401 => CheckKind::UnusedImport(vec!["...".to_string()], false),
            CheckCode::F402 => CheckKind::ImportShadowedByLoopVar("...".to_string(), 1),
            CheckCode::F403 => CheckKind::ImportStarUsed("...".to_string()),
            CheckCode::F404 => CheckKind::LateFutureImport,
@@ -438,8 +468,12 @@ impl CheckCode {
            CheckCode::A003 => CheckKind::BuiltinAttributeShadowing("...".to_string()),
            // flake8-bugbear
            CheckCode::B002 => CheckKind::UnaryPrefixIncrement,
+            CheckCode::B006 => CheckKind::MutableArgumentDefault,
            CheckCode::B007 => CheckKind::UnusedLoopControlVariable("i".to_string()),
            CheckCode::B011 => CheckKind::DoNotAssertFalse,
+            CheckCode::B013 => {
+                CheckKind::RedundantTupleInExceptionHandler("ValueError".to_string())
+            }
            CheckCode::B014 => CheckKind::DuplicateHandlerException(vec!["ValueError".to_string()]),
            CheckCode::B017 => CheckKind::NoAssertRaisesException,
            CheckCode::B025 => CheckKind::DuplicateTryBlockException("Exception".to_string()),
@@ -476,6 +510,11 @@ impl CheckCode {
            // flake8-print
            CheckCode::T201 => CheckKind::PrintFound,
            CheckCode::T203 => CheckKind::PPrintFound,
+            // flake8-quotes
+            CheckCode::Q000 => CheckKind::BadQuotesInlineString(Quote::Double),
+            CheckCode::Q001 => CheckKind::BadQuotesMultilineString(Quote::Double),
+            CheckCode::Q002 => CheckKind::BadQuotesDocstring(Quote::Double),
+            CheckCode::Q003 => CheckKind::AvoidQuoteEscape,
            // pyupgrade
            CheckCode::U001 => CheckKind::UselessMetaclassType,
            CheckCode::U002 => CheckKind::UnnecessaryAbspath,
@@ -545,6 +584,7 @@ impl CheckCode {
            CheckCode::N803 => CheckKind::InvalidArgumentName("...".to_string()),
            CheckCode::N804 => CheckKind::InvalidFirstArgumentNameForClassMethod,
            CheckCode::N805 => CheckKind::InvalidFirstArgumentNameForMethod,
+            CheckCode::N806 => CheckKind::NonLowercaseVariableInFunction("...".to_string()),
            CheckCode::N807 => CheckKind::DunderFunctionName,
            CheckCode::N811 => {
                CheckKind::ConstantImportedAsNonConstant("...".to_string(), "...".to_string())
@@ -558,9 +598,12 @@ impl CheckCode {
            CheckCode::N814 => {
                CheckKind::CamelcaseImportedAsConstant("...".to_string(), "...".to_string())
            }
+            CheckCode::N815 => CheckKind::MixedCaseVariableInClassScope("mixedCase".to_string()),
+            CheckCode::N816 => CheckKind::MixedCaseVariableInGlobalScope("mixedCase".to_string()),
            CheckCode::N817 => {
                CheckKind::CamelcaseImportedAsAcronym("...".to_string(), "...".to_string())
            }
+            CheckCode::N818 => CheckKind::ErrorSuffixOnExceptionName("...".to_string()),
            // Meta
            CheckCode::M001 => CheckKind::UnusedNOQA(None),
        }
@@ -616,8 +659,10 @@ impl CheckCode {
            CheckCode::A002 => CheckCategory::Flake8Builtins,
            CheckCode::A003 => CheckCategory::Flake8Builtins,
            CheckCode::B002 => CheckCategory::Flake8Bugbear,
+            CheckCode::B006 => CheckCategory::Flake8Bugbear,
            CheckCode::B007 => CheckCategory::Flake8Bugbear,
            CheckCode::B011 => CheckCategory::Flake8Bugbear,
+            CheckCode::B013 => CheckCategory::Flake8Bugbear,
            CheckCode::B014 => CheckCategory::Flake8Bugbear,
            CheckCode::B017 => CheckCategory::Flake8Bugbear,
            CheckCode::B025 => CheckCategory::Flake8Bugbear,
@@ -639,6 +684,10 @@ impl CheckCode {
            CheckCode::C417 => CheckCategory::Flake8Comprehensions,
            CheckCode::T201 => CheckCategory::Flake8Print,
            CheckCode::T203 => CheckCategory::Flake8Print,
+            CheckCode::Q000 => CheckCategory::Flake8Quotes,
+            CheckCode::Q001 => CheckCategory::Flake8Quotes,
+            CheckCode::Q002 => CheckCategory::Flake8Quotes,
+            CheckCode::Q003 => CheckCategory::Flake8Quotes,
            CheckCode::U001 => CheckCategory::Pyupgrade,
            CheckCode::U002 => CheckCategory::Pyupgrade,
            CheckCode::U003 => CheckCategory::Pyupgrade,
@@ -696,12 +745,16 @@ impl CheckCode {
            CheckCode::N803 => CheckCategory::PEP8Naming,
            CheckCode::N804 => CheckCategory::PEP8Naming,
            CheckCode::N805 => CheckCategory::PEP8Naming,
+            CheckCode::N806 => CheckCategory::PEP8Naming,
            CheckCode::N807 => CheckCategory::PEP8Naming,
            CheckCode::N811 => CheckCategory::PEP8Naming,
            CheckCode::N812 => CheckCategory::PEP8Naming,
            CheckCode::N813 => CheckCategory::PEP8Naming,
            CheckCode::N814 => CheckCategory::PEP8Naming,
+            CheckCode::N815 => CheckCategory::PEP8Naming,
+            CheckCode::N816 => CheckCategory::PEP8Naming,
            CheckCode::N817 => CheckCategory::PEP8Naming,
+            CheckCode::N818 => CheckCategory::PEP8Naming,
            CheckCode::M001 => CheckCategory::Meta,
        }
    }
@@ -727,14 +780,14 @@ impl CheckKind {
            CheckKind::FutureFeatureNotDefined(_) => &CheckCode::F407,
            CheckKind::IOError(_) => &CheckCode::E902,
            CheckKind::IfTuple => &CheckCode::F634,
-            CheckKind::ImportShadowedByLoopVar(_, _) => &CheckCode::F402,
+            CheckKind::ImportShadowedByLoopVar(..) => &CheckCode::F402,
            CheckKind::ImportStarNotPermitted(_) => &CheckCode::F406,
-            CheckKind::ImportStarUsage(_, _) => &CheckCode::F405,
+            CheckKind::ImportStarUsage(..) => &CheckCode::F405,
            CheckKind::ImportStarUsed(_) => &CheckCode::F403,
            CheckKind::InvalidPrintSyntax => &CheckCode::F633,
            CheckKind::IsLiteral => &CheckCode::F632,
            CheckKind::LateFutureImport => &CheckCode::F404,
-            CheckKind::LineTooLong(_, _) => &CheckCode::E501,
+            CheckKind::LineTooLong(..) => &CheckCode::E501,
            CheckKind::ModuleImportNotAtTopOfFile => &CheckCode::E402,
            CheckKind::MultiValueRepeatedKeyLiteral => &CheckCode::F601,
            CheckKind::MultiValueRepeatedKeyVariable(_) => &CheckCode::F602,
@@ -745,13 +798,13 @@ impl CheckKind {
            CheckKind::ReturnOutsideFunction => &CheckCode::F706,
            CheckKind::SyntaxError(_) => &CheckCode::E999,
            CheckKind::ExpressionsInStarAssignment => &CheckCode::F621,
-            CheckKind::TrueFalseComparison(_, _) => &CheckCode::E712,
+            CheckKind::TrueFalseComparison(..) => &CheckCode::E712,
            CheckKind::TwoStarredExpressions => &CheckCode::F622,
            CheckKind::TypeComparison => &CheckCode::E721,
            CheckKind::UndefinedExport(_) => &CheckCode::F822,
            CheckKind::UndefinedLocal(_) => &CheckCode::F823,
            CheckKind::UndefinedName(_) => &CheckCode::F821,
-            CheckKind::UnusedImport(_) => &CheckCode::F401,
+            CheckKind::UnusedImport(..) => &CheckCode::F401,
            CheckKind::UnusedVariable(_) => &CheckCode::F841,
            CheckKind::YieldOutsideFunction => &CheckCode::F704,
            // pycodestyle warnings
@@ -763,8 +816,10 @@ impl CheckKind {
            CheckKind::BuiltinAttributeShadowing(_) => &CheckCode::A003,
            // flake8-bugbear
            CheckKind::UnaryPrefixIncrement => &CheckCode::B002,
+            CheckKind::MutableArgumentDefault => &CheckCode::B006,
            CheckKind::UnusedLoopControlVariable(_) => &CheckCode::B007,
            CheckKind::DoNotAssertFalse => &CheckCode::B011,
+            CheckKind::RedundantTupleInExceptionHandler(_) => &CheckCode::B013,
            CheckKind::DuplicateHandlerException(_) => &CheckCode::B014,
            CheckKind::NoAssertRaisesException => &CheckCode::B017,
            CheckKind::DuplicateTryBlockException(_) => &CheckCode::B025,
@@ -788,11 +843,16 @@ impl CheckKind {
            // flake8-print
            CheckKind::PrintFound => &CheckCode::T201,
            CheckKind::PPrintFound => &CheckCode::T203,
+            // flake8-quotes
+            CheckKind::BadQuotesInlineString(_) => &CheckCode::Q000,
+            CheckKind::BadQuotesMultilineString(_) => &CheckCode::Q001,
+            CheckKind::BadQuotesDocstring(_) => &CheckCode::Q002,
+            CheckKind::AvoidQuoteEscape => &CheckCode::Q003,
            // pyupgrade
            CheckKind::TypeOfPrimitive(_) => &CheckCode::U003,
            CheckKind::UnnecessaryAbspath => &CheckCode::U002,
            CheckKind::UselessMetaclassType => &CheckCode::U001,
-            CheckKind::DeprecatedUnittestAlias(_, _) => &CheckCode::U005,
+            CheckKind::DeprecatedUnittestAlias(..) => &CheckCode::U005,
            CheckKind::UsePEP585Annotation(_) => &CheckCode::U006,
            CheckKind::UsePEP604Annotation => &CheckCode::U007,
            CheckKind::UselessObjectInheritance(_) => &CheckCode::U004,
@@ -848,12 +908,16 @@ impl CheckKind {
            CheckKind::InvalidArgumentName(_) => &CheckCode::N803,
            CheckKind::InvalidFirstArgumentNameForClassMethod => &CheckCode::N804,
            CheckKind::InvalidFirstArgumentNameForMethod => &CheckCode::N805,
+            CheckKind::NonLowercaseVariableInFunction(..) => &CheckCode::N806,
            CheckKind::DunderFunctionName => &CheckCode::N807,
            CheckKind::ConstantImportedAsNonConstant(..) => &CheckCode::N811,
            CheckKind::LowercaseImportedAsNonLowercase(..) => &CheckCode::N812,
            CheckKind::CamelcaseImportedAsLowercase(..) => &CheckCode::N813,
            CheckKind::CamelcaseImportedAsConstant(..) => &CheckCode::N814,
+            CheckKind::MixedCaseVariableInClassScope(..) => &CheckCode::N815,
+            CheckKind::MixedCaseVariableInGlobalScope(..) => &CheckCode::N816,
            CheckKind::CamelcaseImportedAsAcronym(..) => &CheckCode::N817,
+            CheckKind::ErrorSuffixOnExceptionName(..) => &CheckCode::N818,
            // Meta
            CheckKind::UnusedNOQA(_) => &CheckCode::M001,
        }
@@ -980,19 +1044,25 @@ impl CheckKind {
            CheckKind::UndefinedName(name) => {
                format!("Undefined name `{name}`")
            }
-            CheckKind::UnusedImport(names) => {
+            CheckKind::UnusedImport(names, in_init_py) => {
                let names = names.iter().map(|name| format!("`{name}`")).join(", ");
-                format!("{names} imported but unused")
+                if *in_init_py {
+                    format!("{names} imported but unused and missing from `__all__`")
+                } else {
+                    format!("{names} imported but unused")
+                }
            }
            CheckKind::UnusedVariable(name) => {
                format!("Local variable `{name}` is assigned to but never used")
            }
            CheckKind::YieldOutsideFunction => {
-                "`yield` or `yield from` statement outside of a function/method".to_string()
+                "`yield` or `yield from` statement outside of a function".to_string()
            }
            // pycodestyle warnings
            CheckKind::NoNewLineAtEndOfFile => "No newline at end of file".to_string(),
-            CheckKind::InvalidEscapeSequence(char) => format!("Invalid escape sequence: '\\{char}'"),
+            CheckKind::InvalidEscapeSequence(char) => {
+                format!("Invalid escape sequence: '\\{char}'")
+            }
            // flake8-builtins
            CheckKind::BuiltinVariableShadowing(name) => {
                format!("Variable `{name}` is shadowing a python builtin")
@@ -1004,11 +1074,25 @@ impl CheckKind {
                format!("Class attribute `{name}` is shadowing a python builtin")
            }
            // flake8-bugbear
-            CheckKind::UnaryPrefixIncrement => "Python does not support the unary prefix increment. Writing `++n` is equivalent to `+(+(n))`, which equals `n`. You meant `n += 1`.".to_string(),
-            CheckKind::UnusedLoopControlVariable(name) => format!("Loop control variable `{name}` not used within the loop body. If this is intended, start the name with an underscore."),
-            CheckKind::DoNotAssertFalse => {
-                "Do not `assert False` (`python -O` removes these calls), raise `AssertionError()`"
-                    .to_string()
+            CheckKind::UnaryPrefixIncrement => "Python does not support the unary prefix \
+                                                increment. Writing `++n` is equivalent to \
+                                                `+(+(n))`, which equals `n`. You meant `n += 1`."
+                .to_string(),
+            CheckKind::MutableArgumentDefault => {
+                "Do not use mutable data structures for argument defaults.".to_string()
+            }
+            CheckKind::UnusedLoopControlVariable(name) => format!(
+                "Loop control variable `{name}` not used within the loop body. If this is \
+                 intended, start the name with an underscore."
+            ),
+            CheckKind::DoNotAssertFalse => "Do not `assert False` (`python -O` removes these \
+                                            calls), raise `AssertionError()`"
+                .to_string(),
+            CheckKind::RedundantTupleInExceptionHandler(name) => {
+                format!(
+                    "A length-one tuple literal is redundant. Write `except {name}:` instead of \
+                     `except ({name},):`."
+                )
            }
            CheckKind::DuplicateHandlerException(names) => {
                if names.len() == 1 {
@@ -1020,8 +1104,12 @@ impl CheckKind {
                }
            }
            CheckKind::NoAssertRaisesException => {
-                "`assertRaises(Exception):` should be considered evil. It can lead to your test passing even if the code being tested is never executed due to a typo. Either assert for a more specific exception (builtin or custom), use `assertRaisesRegex`, or use the context manager form of `assertRaises`.".to_string()
-           }
+                "`assertRaises(Exception):` should be considered evil. It can lead to your test \
+                 passing even if the code being tested is never executed due to a typo. Either \
+                 assert for a more specific exception (builtin or custom), use \
+                 `assertRaisesRegex`, or use the context manager form of `assertRaises`."
+                    .to_string()
+            }
            CheckKind::DuplicateTryBlockException(name) => {
                format!("try-except block with duplicate exception `{name}`")
            }
@@ -1053,22 +1141,26 @@ impl CheckKind {
            CheckKind::UnnecessaryLiteralWithinTupleCall(literal) => {
                if literal == "list" {
                    format!(
-                        "Unnecessary `{literal}` literal passed to `tuple()` (rewrite as a `tuple` literal)"
+                        "Unnecessary `{literal}` literal passed to `tuple()` (rewrite as a \
+                         `tuple` literal)"
                    )
                } else {
                    format!(
-                        "Unnecessary `{literal}` literal passed to `tuple()` (remove the outer call to `tuple()`)"
+                        "Unnecessary `{literal}` literal passed to `tuple()` (remove the outer \
+                         call to `tuple()`)"
                    )
                }
            }
            CheckKind::UnnecessaryLiteralWithinListCall(literal) => {
                if literal == "list" {
                    format!(
-                        "Unnecessary `{literal}` literal passed to `list()` (remove the outer call to `list()`)"
+                        "Unnecessary `{literal}` literal passed to `list()` (remove the outer \
+                         call to `list()`)"
                    )
                } else {
                    format!(
-                        "Unnecessary `{literal}` literal passed to `list()` (rewrite as a `list` literal)"
+                        "Unnecessary `{literal}` literal passed to `list()` (rewrite as a `list` \
+                         literal)"
                    )
                }
            }
@@ -1085,7 +1177,7 @@ impl CheckKind {
                format!("Unnecessary subscript reversal of iterable within `{func}()`")
            }
            CheckKind::UnnecessaryComprehension(obj_type) => {
-                format!(" Unnecessary `{obj_type}` comprehension (rewrite using `{obj_type}()`)")
+                format!("Unnecessary `{obj_type}` comprehension (rewrite using `{obj_type}()`)")
            }
            CheckKind::UnnecessaryMap(obj_type) => {
                if obj_type == "generator" {
@@ -1097,6 +1189,30 @@ impl CheckKind {
            // flake8-print
            CheckKind::PrintFound => "`print` found".to_string(),
            CheckKind::PPrintFound => "`pprint` found".to_string(),
+            // flake8-quotes
+            CheckKind::BadQuotesInlineString(quote) => match quote {
+                Quote::Single => "Double quotes found but single quotes preferred".to_string(),
+                Quote::Double => "Single quotes found but double quotes preferred".to_string(),
+            },
+            CheckKind::BadQuotesMultilineString(quote) => match quote {
+                Quote::Single => {
+                    "Double quote multiline found but single quotes preferred".to_string()
+                }
+                Quote::Double => {
+                    "Single quote multiline found but double quotes preferred".to_string()
+                }
+            },
+            CheckKind::BadQuotesDocstring(quote) => match quote {
+                Quote::Single => {
+                    "Double quote docstring found but single quotes preferred".to_string()
+                }
+                Quote::Double => {
+                    "Single quote docstring found but double quotes preferred".to_string()
+                }
+            },
+            CheckKind::AvoidQuoteEscape => {
+                "Change outer quotes to avoid escaping inner quotes".to_string()
+            }
            // pyupgrade
            CheckKind::TypeOfPrimitive(primitive) => {
                format!("Use `{}` instead of `type(...)`", primitive.builtin())
@@ -1106,7 +1222,7 @@ impl CheckKind {
            }
            CheckKind::UselessMetaclassType => "`__metaclass__ = type` is implied".to_string(),
            CheckKind::DeprecatedUnittestAlias(alias, target) => {
-                format!("`{}` is deprecated, use `{}` instead", alias, target)
+                format!("`{alias}` is deprecated, use `{target}` instead")
            }
            CheckKind::UselessObjectInheritance(name) => {
                format!("Class `{name}` inherits from object")
@@ -1135,10 +1251,9 @@ impl CheckKind {
            }
            CheckKind::EndsInPeriod => "First line should end with a period".to_string(),
            CheckKind::NonEmpty => "Docstring is empty".to_string(),
-            CheckKind::EndsInPunctuation => {
-                "First line should end with a period, question mark, or exclamation point"
-                    .to_string()
-            }
+            CheckKind::EndsInPunctuation => "First line should end with a period, question mark, \
+                                             or exclamation point"
+                .to_string(),
            CheckKind::FirstLineCapitalized => {
                "First word of the first line should be properly capitalized".to_string()
            }
@@ -1176,10 +1291,10 @@ impl CheckKind {
            CheckKind::PublicNestedClass => "Missing docstring in public nested class".to_string(),
            CheckKind::PublicInit => "Missing docstring in `__init__`".to_string(),
            CheckKind::NoThisPrefix => {
-                "First word of the docstring should not be `This`".to_string()
+                "First word of the docstring should not be 'This'".to_string()
            }
            CheckKind::SkipDocstring => {
-                "Function decorated with @overload shouldn't contain a docstring".to_string()
+                "Function decorated with `@overload` shouldn't contain a docstring".to_string()
            }
            CheckKind::CapitalizeSectionName(name) => {
                format!("Section name should be properly capitalized (\"{name}\")")
@@ -1200,7 +1315,10 @@ impl CheckKind {
                format!("Missing dashed underline after section (\"{name}\")")
            }
            CheckKind::SectionUnderlineAfterName(name) => {
-                format!("Section underline should be in the line following the section's name (\"{name}\")")
+                format!(
+                    "Section underline should be in the line following the section's name \
+                     (\"{name}\")"
+                )
            }
            CheckKind::SectionUnderlineMatchesSectionLength(name) => {
                format!("Section underline should match the length of its name (\"{name}\")")
@@ -1250,6 +1368,9 @@ impl CheckKind {
            CheckKind::InvalidFirstArgumentNameForMethod => {
                "First argument of a method should be named `self`".to_string()
            }
+            CheckKind::NonLowercaseVariableInFunction(name) => {
+                format!("Variable `{name}` in function should be lowercase")
+            }
            CheckKind::DunderFunctionName => {
                "Function name should not start and end with `__`".to_string()
            }
@@ -1265,9 +1386,18 @@ impl CheckKind {
            CheckKind::CamelcaseImportedAsConstant(name, asname) => {
                format!("Camelcase `{name}` imported as constant `{asname}`")
            }
+            CheckKind::MixedCaseVariableInClassScope(name) => {
+                format!("Variable `{name}` in class scope should not be mixedCase")
+            }
+            CheckKind::MixedCaseVariableInGlobalScope(name) => {
+                format!("Variable `{name}` in global scope should not be mixedCase")
+            }
            CheckKind::CamelcaseImportedAsAcronym(name, asname) => {
                format!("Camelcase `{name}` imported as acronym `{asname}`")
            }
+            CheckKind::ErrorSuffixOnExceptionName(name) => {
+                format!("Exception name `{name}` should be named with an Error suffix")
+            }
            // Meta
            CheckKind::UnusedNOQA(codes) => match codes {
                None => "Unused `noqa` directive".to_string(),
@@ -1288,7 +1418,8 @@ impl CheckKind {
        }
    }

-    /// The summary text for the check. Typically a truncated form of the body text.
+    /// The summary text for the check. Typically a truncated form of the body
+    /// text.
    pub fn summary(&self) -> String {
        match self {
            CheckKind::UnaryPrefixIncrement => {
@@ -1338,7 +1469,16 @@ impl CheckKind {
                | CheckKind::SuperCallWithParameters
                | CheckKind::TypeOfPrimitive(_)
                | CheckKind::UnnecessaryAbspath
-                | CheckKind::UnusedImport(_)
+                | CheckKind::UnnecessaryCollectionCall(_)
+                | CheckKind::UnnecessaryGeneratorDict
+                | CheckKind::UnnecessaryGeneratorList
+                | CheckKind::UnnecessaryGeneratorSet
+                | CheckKind::UnnecessaryListCall
+                | CheckKind::UnnecessaryListComprehensionSet
+                | CheckKind::UnnecessaryLiteralSet(_)
+                | CheckKind::UnnecessaryLiteralWithinListCall(_)
+                | CheckKind::UnnecessaryLiteralWithinTupleCall(_)
+                | CheckKind::UnusedImport(_, false)
                | CheckKind::UnusedLoopControlVariable(_)
                | CheckKind::UnusedNOQA(_)
                | CheckKind::UsePEP585Annotation(_)
--- a/src/checks_gen.rs
+++ b/src/checks_gen.rs
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,3 +1,4 @@
+use std::collections::BTreeMap;
 use std::fmt;
 use std::path::PathBuf;

@@ -5,11 +6,10 @@ use clap::{command, Parser};
 use log::warn;
 use regex::Regex;

-use crate::checks::CheckCode;
+use crate::checks_gen::CheckCodePrefix;
 use crate::printer::SerializationFormat;
-use crate::pyproject::StrCheckCodePair;
-use crate::settings::PythonVersion;
-use crate::RawSettings;
+use crate::settings::configuration::Configuration;
+use crate::settings::types::{PatternPrefixPair, PythonVersion};

 #[derive(Debug, Parser)]
 #[command(author, about = "ruff: An extremely fast Python linter.")]
@@ -26,7 +26,8 @@ pub struct Cli {
    /// Only log errors.
    #[arg(short, long, group = "verbosity")]
    pub quiet: bool,
-    /// Disable all logging (but still exit with status code "1" upon detecting errors).
+    /// Disable all logging (but still exit with status code "1" upon detecting
+    /// errors).
    #[arg(short, long, group = "verbosity")]
    pub silent: bool,
    /// Exit with status code "0", even upon detecting errors.
@@ -43,25 +44,28 @@ pub struct Cli {
    pub no_cache: bool,
    /// List of error codes to enable.
    #[arg(long, value_delimiter = ',')]
-    pub select: Vec<CheckCode>,
-    /// Like --select, but adds additional error codes on top of the selected ones.
+    pub select: Vec<CheckCodePrefix>,
+    /// Like --select, but adds additional error codes on top of the selected
+    /// ones.
    #[arg(long, value_delimiter = ',')]
-    pub extend_select: Vec<CheckCode>,
+    pub extend_select: Vec<CheckCodePrefix>,
    /// List of error codes to ignore.
    #[arg(long, value_delimiter = ',')]
-    pub ignore: Vec<CheckCode>,
-    /// Like --ignore, but adds additional error codes on top of the ignored ones.
+    pub ignore: Vec<CheckCodePrefix>,
+    /// Like --ignore, but adds additional error codes on top of the ignored
+    /// ones.
    #[arg(long, value_delimiter = ',')]
-    pub extend_ignore: Vec<CheckCode>,
+    pub extend_ignore: Vec<CheckCodePrefix>,
    /// List of paths, used to exclude files and/or directories from checks.
    #[arg(long, value_delimiter = ',')]
    pub exclude: Vec<String>,
-    /// Like --exclude, but adds additional files and directories on top of the excluded ones.
+    /// Like --exclude, but adds additional files and directories on top of the
+    /// excluded ones.
    #[arg(long, value_delimiter = ',')]
    pub extend_exclude: Vec<String>,
    /// List of mappings from file pattern to code to exclude
    #[arg(long, value_delimiter = ',')]
-    pub per_file_ignores: Vec<StrCheckCodePair>,
+    pub per_file_ignores: Vec<PatternPrefixPair>,
    /// Output serialization format for error messages.
    #[arg(long, value_enum, default_value_t=SerializationFormat::Text)]
    pub format: SerializationFormat,
@@ -106,10 +110,10 @@ impl fmt::Display for Warnable {
 /// Warn the user if they attempt to enable a code that won't be respected.
 pub fn warn_on(
    flag: Warnable,
-    codes: &[CheckCode],
-    cli_ignore: &[CheckCode],
-    cli_extend_ignore: &[CheckCode],
-    pyproject_settings: &RawSettings,
+    codes: &[CheckCodePrefix],
+    cli_ignore: &[CheckCodePrefix],
+    cli_extend_ignore: &[CheckCodePrefix],
+    pyproject_configuration: &Configuration,
    pyproject_path: &Option<PathBuf>,
 ) {
    for code in codes {
@@ -117,7 +121,7 @@ pub fn warn_on(
            if cli_ignore.contains(code) {
                warn!("{code:?} was passed to {flag}, but ignored via --ignore")
            }
-        } else if pyproject_settings.ignore.contains(code) {
+        } else if pyproject_configuration.ignore.contains(code) {
            if let Some(path) = pyproject_path {
                warn!(
                    "{code:?} was passed to {flag}, but ignored by the `ignore` field in {}",
@@ -131,15 +135,32 @@ pub fn warn_on(
            if cli_extend_ignore.contains(code) {
                warn!("{code:?} was passed to {flag}, but ignored via --extend-ignore")
            }
-        } else if pyproject_settings.extend_ignore.contains(code) {
+        } else if pyproject_configuration.extend_ignore.contains(code) {
            if let Some(path) = pyproject_path {
                warn!(
                    "{code:?} was passed to {flag}, but ignored by the `extend_ignore` field in {}",
                    path.to_string_lossy()
                )
            } else {
-                warn!("{code:?} was passed to {flag}, but ignored by the default `extend_ignore` field")
+                warn!(
+                    "{code:?} was passed to {flag}, but ignored by the default `extend_ignore` \
+                     field"
+                )
            }
        }
    }
 }
+
+/// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
+pub fn collect_per_file_ignores(
+    pairs: Vec<PatternPrefixPair>,
+) -> BTreeMap<String, Vec<CheckCodePrefix>> {
+    let mut per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>> = BTreeMap::new();
+    for pair in pairs {
+        per_file_ignores
+            .entry(pair.pattern)
+            .or_insert_with(Vec::new)
+            .push(pair.prefix);
+    }
+    per_file_ignores
+}
--- a/src/cst/matchers.rs
+++ b/src/cst/matchers.rs
@@ -0,0 +1,19 @@
+use anyhow::Result;
+use libcst_native::Module;
+use rustpython_ast::Located;
+
+use crate::ast::types::Range;
+use crate::source_code_locator::SourceCodeLocator;
+
+pub fn match_tree<'a, T>(
+    locator: &'a SourceCodeLocator,
+    located: &'a Located<T>,
+) -> Result<Module<'a>> {
+    match libcst_native::parse_module(
+        locator.slice_source_code_range(&Range::from_located(located)),
+        None,
+    ) {
+        Ok(module) => Ok(module),
+        Err(_) => return Err(anyhow::anyhow!("Failed to extract CST from source.")),
+    }
+}
--- a/src/cst/mod.rs
+++ b/src/cst/mod.rs
@@ -1 +1,2 @@
 pub mod helpers;
+pub mod matchers;
--- a/src/docstrings/helpers.rs
+++ b/src/docstrings/helpers.rs
@@ -27,8 +27,8 @@ pub fn leading_space(line: &str) -> String {
 /// Extract the leading indentation from a docstring.
 pub fn indentation<'a>(checker: &'a Checker, docstring: &Expr) -> &'a str {
    let range = Range::from_located(docstring);
-    checker.get_locator().slice_source_code_range(&Range {
-        location: Location::new(range.location.row(), 1),
+    checker.locator.slice_source_code_range(&Range {
+        location: Location::new(range.location.row(), 0),
        end_location: Location::new(range.location.row(), range.location.column()),
    })
 }
--- a/src/flake8_bugbear/plugins/assert_false.rs
+++ b/src/flake8_bugbear/plugins/assert_false.rs
@@ -1,6 +1,6 @@
 use rustpython_ast::{Constant, Expr, ExprContext, ExprKind, Stmt, StmtKind};

-use crate::ast::types::Range;
+use crate::ast::types::{CheckLocator, Range};
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
@@ -42,7 +42,10 @@ pub fn assert_false(checker: &mut Checker, stmt: &Stmt, test: &Expr, msg: &Optio
        ..
    } = &test.node
    {
-        let mut check = Check::new(CheckKind::DoNotAssertFalse, Range::from_located(test));
+        let mut check = Check::new(
+            CheckKind::DoNotAssertFalse,
+            checker.locate_check(Range::from_located(test)),
+        );
        if checker.patch() {
            let mut generator = SourceGenerator::new();
            if let Ok(()) = generator.unparse_stmt(&assertion_error(msg)) {
--- a/src/flake8_bugbear/plugins/assert_raises_exception.rs
+++ b/src/flake8_bugbear/plugins/assert_raises_exception.rs
@@ -1,7 +1,7 @@
 use rustpython_ast::{ExprKind, Stmt, Withitem};

 use crate::ast::helpers::match_name_or_attr;
-use crate::ast::types::Range;
+use crate::ast::types::{CheckLocator, Range};
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};

@@ -17,7 +17,7 @@ pub fn assert_raises_exception(checker: &mut Checker, stmt: &Stmt, items: &[With
            {
                checker.add_check(Check::new(
                    CheckKind::NoAssertRaisesException,
-                    Range::from_located(stmt),
+                    checker.locate_check(Range::from_located(stmt)),
                ));
            }
        }
--- a/src/flake8_bugbear/plugins/mod.rs
+++ b/src/flake8_bugbear/plugins/mod.rs
@@ -1,12 +1,15 @@
 pub use assert_false::assert_false;
 pub use assert_raises_exception::assert_raises_exception;
-pub use duplicate_exceptions::duplicate_exceptions;
-pub use duplicate_exceptions::duplicate_handler_exceptions;
+pub use duplicate_exceptions::{duplicate_exceptions, duplicate_handler_exceptions};
+pub use mutable_argument_default::mutable_argument_default;
+pub use redundant_tuple_in_exception_handler::redundant_tuple_in_exception_handler;
 pub use unary_prefix_increment::unary_prefix_increment;
 pub use unused_loop_control_variable::unused_loop_control_variable;

 mod assert_false;
 mod assert_raises_exception;
 mod duplicate_exceptions;
+mod mutable_argument_default;
+mod redundant_tuple_in_exception_handler;
 mod unary_prefix_increment;
 mod unused_loop_control_variable;
--- a/src/flake8_bugbear/plugins/mutable_argument_default.rs
+++ b/src/flake8_bugbear/plugins/mutable_argument_default.rs
@@ -0,0 +1,62 @@
+use rustpython_ast::{Arguments, ExprKind};
+
+use crate::ast::types::{CheckLocator, Range};
+use crate::check_ast::Checker;
+use crate::checks::{Check, CheckKind};
+
+/// B006
+pub fn mutable_argument_default(checker: &mut Checker, arguments: &Arguments) {
+    for expr in arguments
+        .defaults
+        .iter()
+        .chain(arguments.kw_defaults.iter())
+    {
+        match &expr.node {
+            ExprKind::List { .. }
+            | ExprKind::Dict { .. }
+            | ExprKind::Set { .. }
+            | ExprKind::ListComp { .. }
+            | ExprKind::DictComp { .. }
+            | ExprKind::SetComp { .. } => {
+                checker.add_check(Check::new(
+                    CheckKind::MutableArgumentDefault,
+                    checker.locate_check(Range::from_located(expr)),
+                ));
+            }
+            ExprKind::Call { func, .. } => match &func.node {
+                ExprKind::Name { id, .. }
+                    if id == "dict"
+                        || id == "list"
+                        || id == "set"
+                        || id == "Counter"
+                        || id == "OrderedDict"
+                        || id == "defaultdict"
+                        || id == "deque" =>
+                {
+                    checker.add_check(Check::new(
+                        CheckKind::MutableArgumentDefault,
+                        checker.locate_check(Range::from_located(expr)),
+                    ));
+                }
+                ExprKind::Attribute { value, attr, .. }
+                    if (attr == "Counter"
+                        || attr == "OrderedDict"
+                        || attr == "defaultdict"
+                        || attr == "deque") =>
+                {
+                    match &value.node {
+                        ExprKind::Name { id, .. } if id == "collections" => {
+                            checker.add_check(Check::new(
+                                CheckKind::MutableArgumentDefault,
+                                checker.locate_check(Range::from_located(expr)),
+                            ));
+                        }
+                        _ => {}
+                    }
+                }
+                _ => {}
+            },
+            _ => {}
+        }
+    }
+}
--- a/src/flake8_bugbear/plugins/redundant_tuple_in_exception_handler.rs
+++ b/src/flake8_bugbear/plugins/redundant_tuple_in_exception_handler.rs
@@ -0,0 +1,22 @@
+use rustpython_ast::{Excepthandler, ExcepthandlerKind, ExprKind};
+
+use crate::ast::types::{CheckLocator, Range};
+use crate::check_ast::Checker;
+use crate::checks::{Check, CheckKind};
+
+/// B013
+pub fn redundant_tuple_in_exception_handler(checker: &mut Checker, handlers: &[Excepthandler]) {
+    for handler in handlers {
+        let ExcepthandlerKind::ExceptHandler { type_, .. } = &handler.node;
+        if let Some(type_) = type_ {
+            if let ExprKind::Tuple { elts, .. } = &type_.node {
+                if elts.len() == 1 {
+                    checker.add_check(Check::new(
+                        CheckKind::RedundantTupleInExceptionHandler(elts[0].to_string()),
+                        checker.locate_check(Range::from_located(type_)),
+                    ));
+                }
+            }
+        }
+    }
+}
--- a/src/flake8_bugbear/plugins/unary_prefix_increment.rs
+++ b/src/flake8_bugbear/plugins/unary_prefix_increment.rs
@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind, Unaryop};

-use crate::ast::types::Range;
+use crate::ast::types::{CheckLocator, Range};
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};

@@ -11,7 +11,7 @@ pub fn unary_prefix_increment(checker: &mut Checker, expr: &Expr, op: &Unaryop,
            if matches!(op, Unaryop::UAdd) {
                checker.add_check(Check::new(
                    CheckKind::UnaryPrefixIncrement,
-                    Range::from_located(expr),
+                    checker.locate_check(Range::from_located(expr)),
                ))
            }
        }
--- a/src/flake8_bugbear/plugins/unused_loop_control_variable.rs
+++ b/src/flake8_bugbear/plugins/unused_loop_control_variable.rs
@@ -2,7 +2,7 @@ use std::collections::BTreeMap;

 use rustpython_ast::{Expr, ExprKind, Stmt};

-use crate::ast::types::Range;
+use crate::ast::types::{CheckLocator, Range};
 use crate::ast::visitor;
 use crate::ast::visitor::Visitor;
 use crate::autofix::Fix;
@@ -64,7 +64,7 @@ pub fn unused_loop_control_variable(checker: &mut Checker, target: &Expr, body:

        let mut check = Check::new(
            CheckKind::UnusedLoopControlVariable(name.to_string()),
-            Range::from_located(expr),
+            checker.locate_check(Range::from_located(expr)),
        );
        if checker.patch() {
            // Prefix the variable name with an underscore.
--- a/src/flake8_comprehensions/checks.rs
+++ b/src/flake8_comprehensions/checks.rs
@@ -1,8 +1,13 @@
+use log::error;
 use num_bigint::BigInt;
-use rustpython_ast::{Comprehension, Constant, Expr, ExprKind, KeywordData, Located, Unaryop};
+use rustpython_ast::{
+    Comprehension, Constant, Expr, ExprKind, Keyword, KeywordData, Located, Unaryop,
+};

 use crate::ast::types::Range;
 use crate::checks::{Check, CheckKind};
+use crate::flake8_comprehensions::fixes;
+use crate::source_code_locator::SourceCodeLocator;

 fn function_name(func: &Expr) -> Option<&str> {
    if let ExprKind::Name { id, .. } = &func.node {
@@ -16,7 +21,11 @@ fn exactly_one_argument_with_matching_function<'a>(
    name: &str,
    func: &Expr,
    args: &'a [Expr],
+    keywords: &[Keyword],
 ) -> Option<&'a ExprKind> {
+    if !keywords.is_empty() {
+        return None;
+    }
    if args.len() != 1 {
        return None;
    }
@@ -37,40 +46,76 @@ fn first_argument_with_matching_function<'a>(
    Some(&args.first()?.node)
 }

-/// Check `list(generator)` compliance.
-pub fn unnecessary_generator_list(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("list", func, args)?;
+/// C400 (`list(generator)`)
+pub fn unnecessary_generator_list(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("list", func, args, keywords)?;
    if let ExprKind::GeneratorExp { .. } = argument {
-        return Some(Check::new(
-            CheckKind::UnnecessaryGeneratorList,
-            Range::from_located(expr),
-        ));
+        let mut check = Check::new(CheckKind::UnnecessaryGeneratorList, location);
+        if fix {
+            match fixes::fix_unnecessary_generator_list(locator, expr) {
+                Ok(fix) => check.amend(fix),
+                Err(e) => error!("Failed to generate fix: {}", e),
+            }
+        }
+        return Some(check);
    }
    None
 }

-/// Check `set(generator)` compliance.
-pub fn unnecessary_generator_set(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+/// C401 (`set(generator)`)
+pub fn unnecessary_generator_set(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("set", func, args, keywords)?;
    if let ExprKind::GeneratorExp { .. } = argument {
-        return Some(Check::new(
-            CheckKind::UnnecessaryGeneratorSet,
-            Range::from_located(expr),
-        ));
+        let mut check = Check::new(CheckKind::UnnecessaryGeneratorSet, location);
+        if fix {
+            match fixes::fix_unnecessary_generator_set(locator, expr) {
+                Ok(fix) => check.amend(fix),
+                Err(e) => error!("Failed to generate fix: {}", e),
+            }
+        }
+        return Some(check);
    }
    None
 }

-/// Check `dict((x, y) for x, y in iterable)` compliance.
-pub fn unnecessary_generator_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+/// C402 (`dict((x, y) for x, y in iterable)`)
+pub fn unnecessary_generator_dict(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("dict", func, args, keywords)?;
    if let ExprKind::GeneratorExp { elt, .. } = argument {
        match &elt.node {
            ExprKind::Tuple { elts, .. } if elts.len() == 2 => {
-                return Some(Check::new(
-                    CheckKind::UnnecessaryGeneratorDict,
-                    Range::from_located(expr),
-                ));
+                let mut check = Check::new(CheckKind::UnnecessaryGeneratorDict, location);
+                if fix {
+                    match fixes::fix_unnecessary_generator_dict(locator, expr) {
+                        Ok(fix) => check.amend(fix),
+                        Err(e) => error!("Failed to generate fix: {}", e),
+                    }
+                }
+                return Some(check);
            }
            _ => {}
        }
@@ -78,35 +123,44 @@ pub fn unnecessary_generator_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Op
    None
 }

-/// Check `set([...])` compliance.
+/// C403 (`set([...])`)
 pub fn unnecessary_list_comprehension_set(
    expr: &Expr,
    func: &Expr,
    args: &[Expr],
+    keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
 ) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+    let argument = exactly_one_argument_with_matching_function("set", func, args, keywords)?;
    if let ExprKind::ListComp { .. } = &argument {
-        return Some(Check::new(
-            CheckKind::UnnecessaryListComprehensionSet,
-            Range::from_located(expr),
-        ));
+        let mut check = Check::new(CheckKind::UnnecessaryListComprehensionSet, location);
+        if fix {
+            match fixes::fix_unnecessary_list_comprehension_set(locator, expr) {
+                Ok(fix) => check.amend(fix),
+                Err(e) => error!("Failed to generate fix: {}", e),
+            }
+        }
+        return Some(check);
    }
    None
 }

-/// Check `dict([...])` compliance.
+/// C404 (`dict([...])`)
 pub fn unnecessary_list_comprehension_dict(
-    expr: &Expr,
    func: &Expr,
    args: &[Expr],
+    keywords: &[Keyword],
+    location: Range,
 ) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+    let argument = exactly_one_argument_with_matching_function("dict", func, args, keywords)?;
    if let ExprKind::ListComp { elt, .. } = &argument {
        match &elt.node {
            ExprKind::Tuple { elts, .. } if elts.len() == 2 => {
                return Some(Check::new(
                    CheckKind::UnnecessaryListComprehensionDict,
-                    Range::from_located(expr),
+                    location,
                ));
            }
            _ => {}
@@ -115,23 +169,40 @@ pub fn unnecessary_list_comprehension_dict(
    None
 }

-/// Check `set([1, 2])` compliance.
-pub fn unnecessary_literal_set(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+/// C405 (`set([1, 2])`)
+pub fn unnecessary_literal_set(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("set", func, args, keywords)?;
    let kind = match argument {
        ExprKind::List { .. } => "list",
        ExprKind::Tuple { .. } => "tuple",
        _ => return None,
    };
-    Some(Check::new(
-        CheckKind::UnnecessaryLiteralSet(kind.to_string()),
-        Range::from_located(expr),
-    ))
+    let mut check = Check::new(CheckKind::UnnecessaryLiteralSet(kind.to_string()), location);
+    if fix {
+        match fixes::fix_unnecessary_literal_set(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
+        }
+    }
+    Some(check)
 }

-/// Check `dict([(1, 2)])` compliance.
-pub fn unnecessary_literal_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+/// C406 (`dict([(1, 2)])`)
+pub fn unnecessary_literal_dict(
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Keyword],
+    location: Range,
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("dict", func, args, keywords)?;
    let (kind, elts) = match argument {
        ExprKind::Tuple { elts, .. } => ("tuple", elts),
        ExprKind::List { elts, .. } => ("list", elts),
@@ -147,37 +218,57 @@ pub fn unnecessary_literal_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Opti

    Some(Check::new(
        CheckKind::UnnecessaryLiteralDict(kind.to_string()),
-        Range::from_located(expr),
+        location,
    ))
 }

+/// C408
 pub fn unnecessary_collection_call(
    expr: &Expr,
    func: &Expr,
    args: &[Expr],
    keywords: &[Located<KeywordData>],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
 ) -> Option<Check> {
    if !args.is_empty() {
        return None;
    }
    let id = function_name(func)?;
    match id {
-        "list" | "tuple" => {
-            // list() or tuple()
+        "dict" if keywords.is_empty() || keywords.iter().all(|kw| kw.node.arg.is_some()) => {
+            // `dict()` or `dict(a=1)` (as opposed to `dict(**a)`)
+        }
+        "list" | "tuple" => {
+            // `list()` or `tuple()`
        }
-        "dict" if keywords.is_empty() || keywords.iter().all(|kw| kw.node.arg.is_some()) => (),
        _ => return None,
    };
-    Some(Check::new(
+    let mut check = Check::new(
        CheckKind::UnnecessaryCollectionCall(id.to_string()),
-        Range::from_located(expr),
-    ))
+        location,
+    );
+    if fix {
+        // TODO(charlie): Support fixing `dict(a=1)`.
+        if keywords.is_empty() {
+            match fixes::fix_unnecessary_collection_call(locator, expr) {
+                Ok(fix) => check.amend(fix),
+                Err(e) => error!("Failed to generate fix: {}", e),
+            }
+        }
+    }
+    Some(check)
 }

+/// C409
 pub fn unnecessary_literal_within_tuple_call(
    expr: &Expr,
    func: &Expr,
    args: &[Expr],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
 ) -> Option<Check> {
    let argument = first_argument_with_matching_function("tuple", func, args)?;
    let argument_kind = match argument {
@@ -185,16 +276,27 @@ pub fn unnecessary_literal_within_tuple_call(
        ExprKind::List { .. } => "list",
        _ => return None,
    };
-    Some(Check::new(
+    let mut check = Check::new(
        CheckKind::UnnecessaryLiteralWithinTupleCall(argument_kind.to_string()),
-        Range::from_located(expr),
-    ))
+        location,
+    );
+    if fix {
+        match fixes::fix_unnecessary_literal_within_tuple_call(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
+        }
+    }
+    Some(check)
 }

+/// C410
 pub fn unnecessary_literal_within_list_call(
    expr: &Expr,
    func: &Expr,
    args: &[Expr],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
 ) -> Option<Check> {
    let argument = first_argument_with_matching_function("list", func, args)?;
    let argument_kind = match argument {
@@ -202,24 +304,48 @@ pub fn unnecessary_literal_within_list_call(
        ExprKind::List { .. } => "list",
        _ => return None,
    };
-    Some(Check::new(
+    let mut check = Check::new(
        CheckKind::UnnecessaryLiteralWithinListCall(argument_kind.to_string()),
-        Range::from_located(expr),
-    ))
+        location,
+    );
+    if fix {
+        match fixes::fix_unnecessary_literal_within_list_call(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
+        }
+    }
+    Some(check)
 }

-pub fn unnecessary_list_call(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+/// C411
+pub fn unnecessary_list_call(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    locator: &SourceCodeLocator,
+    fix: bool,
+    location: Range,
+) -> Option<Check> {
    let argument = first_argument_with_matching_function("list", func, args)?;
    if let ExprKind::ListComp { .. } = argument {
-        return Some(Check::new(
-            CheckKind::UnnecessaryListCall,
-            Range::from_located(expr),
-        ));
+        let mut check = Check::new(CheckKind::UnnecessaryListCall, location);
+        if fix {
+            match fixes::fix_unnecessary_list_call(locator, expr) {
+                Ok(fix) => check.amend(fix),
+                Err(e) => error!("Failed to generate fix: {}", e),
+            }
+        }
+        return Some(check);
    }
    None
 }

-pub fn unnecessary_call_around_sorted(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+/// C413
+pub fn unnecessary_call_around_sorted(
+    func: &Expr,
+    args: &[Expr],
+    location: Range,
+) -> Option<Check> {
    let outer = function_name(func)?;
    if !(outer == "list" || outer == "reversed") {
        return None;
@@ -228,27 +354,28 @@ pub fn unnecessary_call_around_sorted(expr: &Expr, func: &Expr, args: &[Expr]) -
        if function_name(func)? == "sorted" {
            return Some(Check::new(
                CheckKind::UnnecessaryCallAroundSorted(outer.to_string()),
-                Range::from_located(expr),
+                location,
            ));
        }
    }
    None
 }

+/// C414
 pub fn unnecessary_double_cast_or_process(
-    expr: &Expr,
    func: &Expr,
    args: &[Expr],
+    location: Range,
 ) -> Option<Check> {
    let outer = function_name(func)?;
    if !["list", "tuple", "set", "reversed", "sorted"].contains(&outer) {
        return None;
    }

-    fn new_check(inner: &str, outer: &str, expr: &Expr) -> Check {
+    fn new_check(inner: &str, outer: &str, location: Range) -> Check {
        Check::new(
            CheckKind::UnnecessaryDoubleCastOrProcess(inner.to_string(), outer.to_string()),
-            Range::from_located(expr),
+            location,
        )
    }

@@ -258,23 +385,28 @@ pub fn unnecessary_double_cast_or_process(
        if (outer == "set" || outer == "sorted")
            && (inner == "list" || inner == "tuple" || inner == "reversed" || inner == "sorted")
        {
-            return Some(new_check(inner, outer, expr));
+            return Some(new_check(inner, outer, location));
        }

        // Ex) list(tuple(...))
        if (outer == "list" || outer == "tuple") && (inner == "list" || inner == "tuple") {
-            return Some(new_check(inner, outer, expr));
+            return Some(new_check(inner, outer, location));
        }

        // Ex) set(set(...))
        if outer == "set" && inner == "set" {
-            return Some(new_check(inner, outer, expr));
+            return Some(new_check(inner, outer, location));
        }
    }
    None
 }

-pub fn unnecessary_subscript_reversal(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+/// C415
+pub fn unnecessary_subscript_reversal(
+    func: &Expr,
+    args: &[Expr],
+    location: Range,
+) -> Option<Check> {
    let first_arg = args.first()?;
    let id = function_name(func)?;
    if !["set", "sorted", "reversed"].contains(&id) {
@@ -297,7 +429,7 @@ pub fn unnecessary_subscript_reversal(expr: &Expr, func: &Expr, args: &[Expr]) -
                            if *val == BigInt::from(1) {
                                return Some(Check::new(
                                    CheckKind::UnnecessarySubscriptReversal(id.to_string()),
-                                    Range::from_located(expr),
+                                    location,
                                ));
                            }
                        }
@@ -309,10 +441,12 @@ pub fn unnecessary_subscript_reversal(expr: &Expr, func: &Expr, args: &[Expr]) -
    None
 }

+/// C416
 pub fn unnecessary_comprehension(
    expr: &Expr,
    elt: &Expr,
    generators: &[Comprehension],
+    location: Range,
 ) -> Option<Check> {
    if generators.len() != 1 {
        return None;
@@ -333,29 +467,27 @@ pub fn unnecessary_comprehension(
    };
    Some(Check::new(
        CheckKind::UnnecessaryComprehension(expr_kind.to_string()),
-        Range::from_located(expr),
+        location,
    ))
 }

-pub fn unnecessary_map(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
-    fn new_check(kind: &str, expr: &Expr) -> Check {
-        Check::new(
-            CheckKind::UnnecessaryMap(kind.to_string()),
-            Range::from_located(expr),
-        )
+/// C417
+pub fn unnecessary_map(func: &Expr, args: &[Expr], location: Range) -> Option<Check> {
+    fn new_check(kind: &str, location: Range) -> Check {
+        Check::new(CheckKind::UnnecessaryMap(kind.to_string()), location)
    }
    let id = function_name(func)?;
    match id {
        "map" => {
            if args.len() == 2 && matches!(&args[0].node, ExprKind::Lambda { .. }) {
-                return Some(new_check("generator", expr));
+                return Some(new_check("generator", location));
            }
        }
        "list" | "set" => {
            if let ExprKind::Call { func, args, .. } = &args.first()?.node {
                let argument = first_argument_with_matching_function("map", func, args)?;
                if let ExprKind::Lambda { .. } = argument {
-                    return Some(new_check(id, expr));
+                    return Some(new_check(id, location));
                }
            }
        }
@@ -366,7 +498,7 @@ pub fn unnecessary_map(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check>
                    if let ExprKind::Lambda { body, .. } = &argument {
                        if matches!(&body.node, ExprKind::Tuple { elts, .. } | ExprKind::List { elts, .. } if elts.len() == 2)
                        {
-                            return Some(new_check(id, expr));
+                            return Some(new_check(id, location));
                        }
                    }
                }
--- a/src/flake8_comprehensions/fixes.rs
+++ b/src/flake8_comprehensions/fixes.rs
@@ -0,0 +1,473 @@
+use anyhow::Result;
+use libcst_native::{
+    Arg, Call, Codegen, Dict, DictComp, Element, Expr, Expression, LeftCurlyBrace, LeftParen,
+    LeftSquareBracket, List, ListComp, Module, ParenthesizableWhitespace, RightCurlyBrace,
+    RightParen, RightSquareBracket, Set, SetComp, SimpleWhitespace, SmallStatement, Statement,
+    Tuple,
+};
+
+use crate::autofix::Fix;
+use crate::cst::matchers::match_tree;
+use crate::source_code_locator::SourceCodeLocator;
+
+fn match_expr<'a, 'b>(module: &'a mut Module<'b>) -> Result<&'a mut Expr<'b>> {
+    if let Some(Statement::Simple(expr)) = module.body.first_mut() {
+        if let Some(SmallStatement::Expr(expr)) = expr.body.first_mut() {
+            Ok(expr)
+        } else {
+            Err(anyhow::anyhow!(
+                "Expected node to be: SmallStatement::Expr."
+            ))
+        }
+    } else {
+        Err(anyhow::anyhow!("Expected node to be: Statement::Simple."))
+    }
+}
+
+fn match_call<'a, 'b>(expr: &'a mut Expr<'b>) -> Result<&'a mut Call<'b>> {
+    if let Expression::Call(call) = &mut expr.value {
+        Ok(call)
+    } else {
+        Err(anyhow::anyhow!("Expected node to be: Expression::Call."))
+    }
+}
+
+fn match_arg<'a, 'b>(call: &'a Call<'b>) -> Result<&'a Arg<'b>> {
+    if let Some(arg) = call.args.first() {
+        Ok(arg)
+    } else {
+        Err(anyhow::anyhow!("Expected node to be: Arg."))
+    }
+}
+
+/// (C400) Convert `list(x for x in y)` to `[x for x in y]`.
+pub fn fix_unnecessary_generator_list(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(GeneratorExp)))) -> Expr(ListComp)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    let generator_exp = if let Expression::GeneratorExp(generator_exp) = &arg.value {
+        generator_exp
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: Expression::GeneratorExp."
+        ));
+    };
+
+    body.value = Expression::ListComp(Box::new(ListComp {
+        elt: generator_exp.elt.clone(),
+        for_in: generator_exp.for_in.clone(),
+        lbracket: LeftSquareBracket {
+            whitespace_after: call.whitespace_before_args.clone(),
+        },
+        rbracket: RightSquareBracket {
+            whitespace_before: arg.whitespace_after_arg.clone(),
+        },
+        lpar: generator_exp.lpar.clone(),
+        rpar: generator_exp.rpar.clone(),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C401) Convert `set(x for x in y)` to `{x for x in y}`.
+pub fn fix_unnecessary_generator_set(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(GeneratorExp)))) -> Expr(SetComp)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    let generator_exp = if let Expression::GeneratorExp(generator_exp) = &arg.value {
+        generator_exp
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: Expression::GeneratorExp."
+        ));
+    };
+
+    body.value = Expression::SetComp(Box::new(SetComp {
+        elt: generator_exp.elt.clone(),
+        for_in: generator_exp.for_in.clone(),
+        lbrace: LeftCurlyBrace {
+            whitespace_after: call.whitespace_before_args.clone(),
+        },
+        rbrace: RightCurlyBrace {
+            whitespace_before: arg.whitespace_after_arg.clone(),
+        },
+        lpar: generator_exp.lpar.clone(),
+        rpar: generator_exp.rpar.clone(),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C402) Convert `dict((x, x) for x in range(3))` to `{x: x for x in
+/// range(3)}`.
+pub fn fix_unnecessary_generator_dict(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    // Extract the (k, v) from `(k, v) for ...`.
+    let generator_exp = if let Expression::GeneratorExp(generator_exp) = &arg.value {
+        generator_exp
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: Expression::GeneratorExp."
+        ));
+    };
+    let tuple = if let Expression::Tuple(tuple) = &generator_exp.elt.as_ref() {
+        tuple
+    } else {
+        return Err(anyhow::anyhow!("Expected node to be: Expression::Tuple."));
+    };
+    let key = if let Some(Element::Simple { value, .. }) = &tuple.elements.get(0) {
+        value
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected tuple to contain a key as the first element."
+        ));
+    };
+    let value = if let Some(Element::Simple { value, .. }) = &tuple.elements.get(1) {
+        value
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected tuple to contain a key as the second element."
+        ));
+    };
+
+    body.value = Expression::DictComp(Box::new(DictComp {
+        key: Box::new(key.clone()),
+        value: Box::new(value.clone()),
+        for_in: generator_exp.for_in.clone(),
+        lbrace: LeftCurlyBrace {
+            whitespace_after: call.whitespace_before_args.clone(),
+        },
+        rbrace: RightCurlyBrace {
+            whitespace_before: arg.whitespace_after_arg.clone(),
+        },
+        lpar: Default::default(),
+        rpar: Default::default(),
+        whitespace_before_colon: Default::default(),
+        whitespace_after_colon: ParenthesizableWhitespace::SimpleWhitespace(SimpleWhitespace(" ")),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C403) Convert `set([x for x in y])` to `{x for x in y}`.
+pub fn fix_unnecessary_list_comprehension_set(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(ListComp)))) ->
+    // Expr(SetComp)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    let list_comp = if let Expression::ListComp(list_comp) = &arg.value {
+        list_comp
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: Expression::ListComp."
+        ));
+    };
+
+    body.value = Expression::SetComp(Box::new(SetComp {
+        elt: list_comp.elt.clone(),
+        for_in: list_comp.for_in.clone(),
+        lbrace: LeftCurlyBrace {
+            whitespace_after: call.whitespace_before_args.clone(),
+        },
+        rbrace: RightCurlyBrace {
+            whitespace_before: arg.whitespace_after_arg.clone(),
+        },
+        lpar: list_comp.lpar.clone(),
+        rpar: list_comp.rpar.clone(),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C405) Convert `set((1, 2))` to `{1, 2}`.
+pub fn fix_unnecessary_literal_set(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(List|Tuple)))) -> Expr(Set)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let mut call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    let elements = match &arg.value {
+        Expression::Tuple(inner) => &inner.elements,
+        Expression::List(inner) => &inner.elements,
+        _ => {
+            return Err(anyhow::anyhow!(
+                "Expected node to be: Expression::Tuple | Expression::List."
+            ))
+        }
+    };
+
+    if elements.is_empty() {
+        call.args = vec![];
+    } else {
+        body.value = Expression::Set(Box::new(Set {
+            elements: elements.clone(),
+            lbrace: LeftCurlyBrace {
+                whitespace_after: call.whitespace_before_args.clone(),
+            },
+            rbrace: RightCurlyBrace {
+                whitespace_before: arg.whitespace_after_arg.clone(),
+            },
+            lpar: Default::default(),
+            rpar: Default::default(),
+        }));
+    }
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C408)
+pub fn fix_unnecessary_collection_call(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call("list" | "tuple" | "dict")))) -> Expr(List|Tuple|Dict)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let name = if let Expression::Name(name) = &call.func.as_ref() {
+        name
+    } else {
+        return Err(anyhow::anyhow!("Expected node to be: Expression::Name."));
+    };
+
+    match name.value {
+        "tuple" => {
+            body.value = Expression::Tuple(Box::new(Tuple {
+                elements: Default::default(),
+                lpar: vec![Default::default()],
+                rpar: vec![Default::default()],
+            }));
+        }
+        "list" => {
+            body.value = Expression::List(Box::new(List {
+                elements: Default::default(),
+                lbracket: Default::default(),
+                rbracket: Default::default(),
+                lpar: Default::default(),
+                rpar: Default::default(),
+            }));
+        }
+        "dict" => {
+            body.value = Expression::Dict(Box::new(Dict {
+                elements: Default::default(),
+                lbrace: Default::default(),
+                rbrace: Default::default(),
+                lpar: Default::default(),
+                rpar: Default::default(),
+            }));
+        }
+        _ => {
+            return Err(anyhow::anyhow!("Expected function name to be one of: \
+                                        'tuple', 'list', 'dict'."
+                .to_string()));
+        }
+    };
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C409) Convert `tuple([1, 2])` to `tuple(1, 2)`
+pub fn fix_unnecessary_literal_within_tuple_call(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+    let (elements, whitespace_after, whitespace_before) = match &arg.value {
+        Expression::Tuple(inner) => (
+            &inner.elements,
+            &inner
+                .lpar
+                .first()
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .whitespace_after,
+            &inner
+                .rpar
+                .first()
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .whitespace_before,
+        ),
+        Expression::List(inner) => (
+            &inner.elements,
+            &inner.lbracket.whitespace_after,
+            &inner.rbracket.whitespace_before,
+        ),
+        _ => {
+            return Err(anyhow::anyhow!(
+                "Expected node to be: Expression::Tuple | Expression::List."
+            ))
+        }
+    };
+
+    body.value = Expression::Tuple(Box::new(Tuple {
+        elements: elements.clone(),
+        lpar: vec![LeftParen {
+            whitespace_after: whitespace_after.clone(),
+        }],
+        rpar: vec![RightParen {
+            whitespace_before: whitespace_before.clone(),
+        }],
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C410) Convert `list([1, 2])` to `[1, 2]`
+pub fn fix_unnecessary_literal_within_list_call(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+    let (elements, whitespace_after, whitespace_before) = match &arg.value {
+        Expression::Tuple(inner) => (
+            &inner.elements,
+            &inner
+                .lpar
+                .first()
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .whitespace_after,
+            &inner
+                .rpar
+                .first()
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .whitespace_before,
+        ),
+        Expression::List(inner) => (
+            &inner.elements,
+            &inner.lbracket.whitespace_after,
+            &inner.rbracket.whitespace_before,
+        ),
+        _ => {
+            return Err(anyhow::anyhow!(
+                "Expected node to be: Expression::Tuple | Expression::List."
+            ))
+        }
+    };
+
+    body.value = Expression::List(Box::new(List {
+        elements: elements.clone(),
+        lbracket: LeftSquareBracket {
+            whitespace_after: whitespace_after.clone(),
+        },
+        rbracket: RightSquareBracket {
+            whitespace_before: whitespace_before.clone(),
+        },
+        lpar: Default::default(),
+        rpar: Default::default(),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
+/// (C411) Convert `list([i for i in x])` to `[i for i in x]`.
+pub fn fix_unnecessary_list_call(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(List|Tuple)))) -> Expr(List|Tuple)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    body.value = arg.value.clone();
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
--- a/src/flake8_comprehensions/mod.rs
+++ b/src/flake8_comprehensions/mod.rs
@@ -1 +1,2 @@
 pub mod checks;
+mod fixes;
--- a/src/flake8_print/checks.rs
+++ b/src/flake8_print/checks.rs
@@ -9,25 +9,20 @@ pub fn print_call(
    func: &Expr,
    check_print: bool,
    check_pprint: bool,
+    location: Range,
 ) -> Option<Check> {
    if let ExprKind::Name { id, .. } = &func.node {
        if check_print && id == "print" {
            return Some(Check::new(CheckKind::PrintFound, Range::from_located(expr)));
        } else if check_pprint && id == "pprint" {
-            return Some(Check::new(
-                CheckKind::PPrintFound,
-                Range::from_located(expr),
-            ));
+            return Some(Check::new(CheckKind::PPrintFound, location));
        }
    }

    if let ExprKind::Attribute { value, attr, .. } = &func.node {
        if let ExprKind::Name { id, .. } = &value.node {
            if check_pprint && id == "pprint" && attr == "pprint" {
-                return Some(Check::new(
-                    CheckKind::PPrintFound,
-                    Range::from_located(expr),
-                ));
+                return Some(Check::new(CheckKind::PPrintFound, location));
            }
        }
    }
--- a/src/flake8_print/plugins/print_call.rs
+++ b/src/flake8_print/plugins/print_call.rs
@@ -1,6 +1,7 @@
 use log::error;
 use rustpython_ast::{Expr, Stmt, StmtKind};

+use crate::ast::types::{CheckLocator, Range};
 use crate::autofix::helpers;
 use crate::check_ast::Checker;
 use crate::checks::CheckCode;
@@ -12,6 +13,7 @@ pub fn print_call(checker: &mut Checker, expr: &Expr, func: &Expr) {
        func,
        checker.settings.enabled.contains(&CheckCode::T201),
        checker.settings.enabled.contains(&CheckCode::T203),
+        checker.locate_check(Range::from_located(expr)),
    ) {
        if checker.patch() {
            let context = checker.binding_context();
--- a/src/flake8_quotes/checks.rs
+++ b/src/flake8_quotes/checks.rs
@@ -0,0 +1,297 @@
+use rustpython_ast::Location;
+
+use crate::ast::types::Range;
+use crate::checks::{Check, CheckKind};
+use crate::flake8_quotes::settings::{Quote, Settings};
+use crate::source_code_locator::SourceCodeLocator;
+
+fn good_single(quote: &Quote) -> char {
+    match quote {
+        Quote::Single => '\'',
+        Quote::Double => '"',
+    }
+}
+
+fn bad_single(quote: &Quote) -> char {
+    match quote {
+        Quote::Double => '\'',
+        Quote::Single => '"',
+    }
+}
+
+fn good_multiline(quote: &Quote) -> &str {
+    match quote {
+        Quote::Single => "'''",
+        Quote::Double => "\"\"\"",
+    }
+}
+
+fn good_multiline_ending(quote: &Quote) -> &str {
+    match quote {
+        Quote::Single => "'\"\"\"",
+        Quote::Double => "\"'''",
+    }
+}
+
+fn good_docstring(quote: &Quote) -> &str {
+    match quote {
+        Quote::Single => "'''",
+        Quote::Double => "\"\"\"",
+    }
+}
+
+pub fn quotes(
+    locator: &SourceCodeLocator,
+    start: &Location,
+    end: &Location,
+    is_docstring: bool,
+    settings: &Settings,
+) -> Option<Check> {
+    let text = locator.slice_source_code_range(&Range {
+        location: *start,
+        end_location: *end,
+    });
+
+    // Remove any prefixes (e.g., remove `u` from `u"foo"`).
+    let last_quote_char = text.chars().last().unwrap();
+    let first_quote_char = text.find(last_quote_char).unwrap();
+    let prefix = &text[..first_quote_char].to_lowercase();
+    let raw_text = &text[first_quote_char..];
+
+    // Determine if the string is multiline-based.
+    let is_multiline = if raw_text.len() >= 3 {
+        let mut chars = raw_text.chars();
+        let first = chars.next().unwrap();
+        let second = chars.next().unwrap();
+        let third = chars.next().unwrap();
+        first == second && second == third
+    } else {
+        false
+    };
+
+    if is_docstring {
+        if raw_text.contains(good_docstring(&settings.docstring_quotes)) {
+            return None;
+        }
+
+        return Some(Check::new(
+            CheckKind::BadQuotesDocstring(settings.docstring_quotes.clone()),
+            Range {
+                location: *start,
+                end_location: *end,
+            },
+        ));
+    } else if is_multiline {
+        // If our string is or contains a known good string, ignore it.
+        if raw_text.contains(good_multiline(&settings.multiline_quotes)) {
+            return None;
+        }
+
+        // If our string ends with a known good ending, then ignore it.
+        if raw_text.ends_with(good_multiline_ending(&settings.multiline_quotes)) {
+            return None;
+        }
+
+        return Some(Check::new(
+            CheckKind::BadQuotesMultilineString(settings.multiline_quotes.clone()),
+            Range {
+                location: *start,
+                end_location: *end,
+            },
+        ));
+    } else {
+        let string_contents = &raw_text[1..raw_text.len() - 1];
+
+        // If we're using the preferred quotation type, check for escapes.
+        if last_quote_char == good_single(&settings.inline_quotes) {
+            if !settings.avoid_escape || prefix.contains('r') {
+                return None;
+            }
+            if string_contents.contains(good_single(&settings.inline_quotes))
+                && !string_contents.contains(bad_single(&settings.inline_quotes))
+            {
+                return Some(Check::new(
+                    CheckKind::AvoidQuoteEscape,
+                    Range {
+                        location: *start,
+                        end_location: *end,
+                    },
+                ));
+            }
+            return None;
+        }
+
+        // If we're not using the preferred type, only allow use to avoid escapes.
+        if !string_contents.contains(good_single(&settings.inline_quotes)) {
+            return Some(Check::new(
+                CheckKind::BadQuotesInlineString(settings.inline_quotes.clone()),
+                Range {
+                    location: *start,
+                    end_location: *end,
+                },
+            ));
+        }
+    }
+
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    use anyhow::Result;
+    use rustpython_parser::lexer::LexResult;
+    use test_case::test_case;
+
+    use crate::autofix::fixer;
+    use crate::checks::{Check, CheckCode};
+    use crate::flake8_quotes::settings::Quote;
+    use crate::linter::tokenize;
+    use crate::{flake8_quotes, fs, linter, noqa, Settings};
+
+    fn check_path(path: &Path, settings: &Settings, autofix: &fixer::Mode) -> Result<Vec<Check>> {
+        let contents = fs::read_file(path)?;
+        let tokens: Vec<LexResult> = tokenize(&contents);
+        let noqa_line_for = noqa::extract_noqa_line_for(&tokens);
+        linter::check_path(path, &contents, tokens, &noqa_line_for, settings, autofix)
+    }
+
+    #[test_case(Path::new("doubles.py"))]
+    #[test_case(Path::new("doubles_escaped.py"))]
+    #[test_case(Path::new("doubles_multiline_string.py"))]
+    #[test_case(Path::new("doubles_noqa.py"))]
+    #[test_case(Path::new("doubles_wrapped.py"))]
+    fn doubles(path: &Path) -> Result<()> {
+        let snapshot = format!("doubles_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Single,
+                    docstring_quotes: Quote::Single,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("singles.py"))]
+    #[test_case(Path::new("singles_escaped.py"))]
+    #[test_case(Path::new("singles_multiline_string.py"))]
+    #[test_case(Path::new("singles_noqa.py"))]
+    #[test_case(Path::new("singles_wrapped.py"))]
+    fn singles(path: &Path) -> Result<()> {
+        let snapshot = format!("singles_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Double,
+                    multiline_quotes: Quote::Double,
+                    docstring_quotes: Quote::Double,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("docstring_doubles.py"))]
+    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_doubles_class.py"))]
+    #[test_case(Path::new("docstring_doubles_function.py"))]
+    #[test_case(Path::new("docstring_singles.py"))]
+    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_singles_class.py"))]
+    #[test_case(Path::new("docstring_singles_function.py"))]
+    fn double_docstring(path: &Path) -> Result<()> {
+        let snapshot = format!("double_docstring_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Single,
+                    docstring_quotes: Quote::Double,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("docstring_doubles.py"))]
+    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_doubles_class.py"))]
+    #[test_case(Path::new("docstring_doubles_function.py"))]
+    #[test_case(Path::new("docstring_singles.py"))]
+    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_singles_class.py"))]
+    #[test_case(Path::new("docstring_singles_function.py"))]
+    fn single_docstring(path: &Path) -> Result<()> {
+        let snapshot = format!("single_docstring_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Double,
+                    docstring_quotes: Quote::Single,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+}
--- a/src/flake8_quotes/docstring_detection.rs
+++ b/src/flake8_quotes/docstring_detection.rs
@@ -0,0 +1,125 @@
+//! Extract docstrings via tokenization.
+//!
+//! See: https://github.com/zheller/flake8-quotes/blob/ef0d9a90249a080e460b70ab62bf4b65e5aa5816/flake8_quotes/docstring_detection.py#L29
+//!
+//! TODO(charlie): Consolidate with the existing AST-based docstring extraction.
+
+use rustpython_parser::lexer::Tok;
+
+#[derive(Debug)]
+enum State {
+    // Start of the module: first string gets marked as a docstring.
+    ExpectModuleDocstring,
+    // After seeing a class definition, we're waiting for the block colon (and do bracket
+    // counting).
+    ExpectClassColon,
+    // After seeing the block colon in a class definition, we expect a docstring.
+    ExpectClassDocstring,
+    // Same as ExpectClassColon, but for function definitions.
+    ExpectFunctionColon,
+    // Same as ExpectClassDocstring, but for function definitions.
+    ExpectFunctionDocstring,
+    // Skip tokens until we observe a `class` or `def`.
+    Other,
+}
+
+pub struct StateMachine {
+    state: State,
+    bracket_count: usize,
+}
+
+impl Default for StateMachine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl StateMachine {
+    pub fn new() -> Self {
+        Self {
+            state: State::ExpectModuleDocstring,
+            bracket_count: 0,
+        }
+    }
+
+    pub fn consume(&mut self, tok: &Tok) -> bool {
+        if matches!(tok, Tok::Newline | Tok::Indent | Tok::Dedent) {
+            return false;
+        }
+
+        if matches!(tok, Tok::String { .. }) {
+            return if matches!(
+                self.state,
+                State::ExpectModuleDocstring
+                    | State::ExpectClassDocstring
+                    | State::ExpectFunctionDocstring
+            ) {
+                self.state = State::Other;
+                true
+            } else {
+                false
+            };
+        }
+
+        if matches!(tok, Tok::Class) {
+            self.state = State::ExpectClassColon;
+            self.bracket_count = 0;
+            return false;
+        }
+
+        if matches!(tok, Tok::Def) {
+            self.state = State::ExpectFunctionColon;
+            self.bracket_count = 0;
+            return false;
+        }
+
+        if matches!(tok, Tok::Colon) {
+            if self.bracket_count == 0 {
+                if matches!(self.state, State::ExpectClassColon) {
+                    self.state = State::ExpectClassDocstring;
+                } else if matches!(self.state, State::ExpectFunctionColon) {
+                    self.state = State::ExpectFunctionDocstring;
+                }
+            }
+            return false;
+        }
+
+        if matches!(tok, Tok::Lpar | Tok::Lbrace | Tok::Lsqb) {
+            self.bracket_count += 1;
+            if matches!(
+                self.state,
+                State::ExpectModuleDocstring
+                    | State::ExpectClassDocstring
+                    | State::ExpectFunctionDocstring
+            ) {
+                self.state = State::Other;
+            }
+            return false;
+        }
+
+        if matches!(tok, Tok::Rpar | Tok::Rbrace | Tok::Rsqb) {
+            self.bracket_count -= 1;
+            if matches!(
+                self.state,
+                State::ExpectModuleDocstring
+                    | State::ExpectClassDocstring
+                    | State::ExpectFunctionDocstring
+            ) {
+                self.state = State::Other;
+            }
+            return false;
+        }
+
+        if matches!(
+            self.state,
+            State::ExpectModuleDocstring
+                | State::ExpectClassDocstring
+                | State::ExpectFunctionDocstring
+        ) {
+            self.state = State::Other;
+            return false;
+        }
+
+        false
+    }
+}
--- a/src/flake8_quotes/mod.rs
+++ b/src/flake8_quotes/mod.rs
@@ -0,0 +1,3 @@
+pub mod checks;
+pub mod docstring_detection;
+pub mod settings;
--- a/src/flake8_quotes/settings.rs
+++ b/src/flake8_quotes/settings.rs
@@ -0,0 +1,49 @@
+//! Settings for the `flake-quotes` plugin.
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Hash)]
+#[serde(deny_unknown_fields, rename_all = "kebab-case")]
+pub enum Quote {
+    Single,
+    Double,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(deny_unknown_fields, rename_all = "kebab-case")]
+pub struct Options {
+    pub inline_quotes: Option<Quote>,
+    pub multiline_quotes: Option<Quote>,
+    pub docstring_quotes: Option<Quote>,
+    pub avoid_escape: Option<bool>,
+}
+
+#[derive(Debug, Hash)]
+pub struct Settings {
+    pub inline_quotes: Quote,
+    pub multiline_quotes: Quote,
+    pub docstring_quotes: Quote,
+    pub avoid_escape: bool,
+}
+
+impl Settings {
+    pub fn from_options(options: Options) -> Self {
+        Self {
+            inline_quotes: options.inline_quotes.unwrap_or(Quote::Double),
+            multiline_quotes: options.multiline_quotes.unwrap_or(Quote::Double),
+            docstring_quotes: options.docstring_quotes.unwrap_or(Quote::Double),
+            avoid_escape: options.avoid_escape.unwrap_or(true),
+        }
+    }
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Self {
+            inline_quotes: Quote::Double,
+            multiline_quotes: Quote::Double,
+            docstring_quotes: Quote::Double,
+            avoid_escape: true,
+        }
+    }
+}
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles.py.snap
@@ -0,0 +1,50 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 5
+    column: 0
+  end_location:
+    row: 7
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 16
+    column: 4
+  end_location:
+    row: 18
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 21
+    column: 20
+  end_location:
+    row: 22
+    column: 37
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 30
+    column: 8
+  end_location:
+    row: 32
+    column: 11
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 35
+    column: 12
+  end_location:
+    row: 37
+    column: 15
+  fix: ~
+
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_class.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_class.py.snap
@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 27
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 5
+    column: 22
+  end_location:
+    row: 5
+    column: 43
+  fix: ~
+
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_function.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_function.py.snap
@@ -0,0 +1,50 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 11
+    column: 4
+  end_location:
+    row: 11
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 15
+    column: 38
+  end_location:
+    row: 17
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 17
+    column: 4
+  end_location:
+    row: 17
+    column: 19
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 21
+    column: 4
+  end_location:
+    row: 21
+    column: 27
+  fix: ~
+
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_module_multiline.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_module_multiline.py.snap
@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 4
+    column: 0
+  end_location:
+    row: 6
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 9
+    column: 0
+  end_location:
+    row: 11
+    column: 3
+  fix: ~
+
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_module_singleline.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_doubles_module_singleline.py.snap
@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 2
+    column: 0
+  end_location:
+    row: 2
+    column: 31
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 6
+    column: 0
+  end_location:
+    row: 6
+    column: 31
+  fix: ~
+
--- a/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_singles.py.snap
+++ b/src/flake8_quotes/snapshots/ruff__flake8_quotescheckstests__double_docstring_docstring_singles.py.snap
@@ -0,0 +1,32 @@
+---
+source: src/flake8_quotes/checks.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 14
+    column: 4
+  end_location:
+    row: 16
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 26
+    column: 8
+  end_location:
+    row: 28
+    column: 11
+  fix: ~
+
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Charlie Marsh	e00bcd19f5	Bump version to 0.0.97	2022-11-02 22:38:43 -04:00
Charlie Marsh	4550581be2	Relax lowercase condition in N806 (#562 )	2022-11-02 22:38:29 -04:00
Charlie Marsh	b42d77a4c6	Avoid autofixes for errors in f-strings (#561 )	2022-11-02 22:31:57 -04:00
Charlie Marsh	e473df1fe9	Bump version to 0.0.96	2022-11-02 22:10:56 -04:00
Charlie Marsh	d448281b33	Add plugin properties to settings cache key (#559 )	2022-11-02 22:10:01 -04:00
Charlie Marsh	94597fefc1	Change flake8-quotes default to double quotes (#558 )	2022-11-02 22:03:54 -04:00
Charlie Marsh	add0bdeeb7	DRY up utilities in flake8_comprehensions/fixes.rs (#556 )	2022-11-02 22:00:53 -04:00
Charlie Marsh	6a180b95d1	Implement autofix for dict and tuple comprehensions (#555 )	2022-11-02 21:36:20 -04:00
Charlie Marsh	416c338237	Respect trailing whitespace in comprehension fixes (#554 )	2022-11-02 21:08:17 -04:00
Charlie Marsh	9948be0145	Automatically fix a variety of comprehension rules (#553 )	2022-11-02 20:39:35 -04:00
Charlie Marsh	f50ff61056	Expose autofix mode in public API (#551 )	2022-11-02 09:44:46 -04:00
Charlie Marsh	017fec2bc5	Set override in actions-rs/toolchain@v1 (#543 )	2022-11-02 09:36:22 -04:00
Charlie Marsh	f9def0a139	Bump version to 0.0.95	2022-11-02 09:03:34 -04:00
StefanBRas	d4fc485a76	Update README.md to use table for per-file-ignore (#549 )	2022-11-02 09:02:11 -04:00
Charlie Marsh	0827d0beef	Account for typing_extensions for annotation parsing (#550 )	2022-11-02 09:01:12 -04:00
Charlie Marsh	b4a46ab6f0	Add tests for converter.rs (#542 )	2022-11-01 22:36:08 -04:00
Charlie Marsh	f6e14edc3e	Use max-line-length in converter.rs (#541 )	2022-11-01 22:27:13 -04:00
Charlie Marsh	878a94f9cb	Add a rust-toolchain.toml file (#538 )	2022-11-01 20:34:58 -04:00
Charlie Marsh	79ca66ace5	Use nightly rustfmt with rustfmt.toml (#536 )	2022-11-01 20:34:38 -04:00
fsouza	c68c6b5424	Make columns indices 1-based in the text output format (#539 )	2022-11-01 19:06:08 -04:00
Charlie Marsh	bad5723d80	Add plugin configuration to flake8-to-ruff (#535 )	2022-11-01 17:08:53 -04:00
Charlie Marsh	2d83f99dbf	Bump version to 0.0.94	2022-11-01 16:38:59 -04:00
Charlie Marsh	5123b38758	Refine list of annotatable subscripts (#534 )	2022-11-01 16:36:05 -04:00
Charlie Marsh	e9a4c8ba13	Track typing module imports (#533 )	2022-11-01 14:01:59 -04:00
Charlie Marsh	927d716edd	Enable flake8-to-ruff builds on all platforms	2022-11-01 12:15:43 -04:00
Charlie Marsh	df6a48fced	Use separate tokens for each PyPI release	2022-10-31 22:43:38 -04:00
Charlie Marsh	91a8277ac0	Always release flake8-to-ruff	2022-10-31 22:16:28 -04:00
Charlie Marsh	5797884262	Represent per-file ignores as a map (#531 )	2022-10-31 22:15:33 -04:00
Charlie Marsh	5aa8455258	Misc. improvements to flake8-to-ruff	2022-10-31 18:38:47 -04:00
Charlie Marsh	8fd713739b	Use pretty-print for flake8-to-ruff	2022-10-31 17:52:03 -04:00
Charlie Marsh	5de1fcd653	Add to flake8-to-ruff README	2022-10-31 17:50:32 -04:00
Charlie Marsh	032f4f3f12	Set maturin path when building flake8-to-ruff	2022-10-31 16:49:45 -04:00
Charlie Marsh	621db96e7f	Use more consistent Option in pyproject settings (#530 )	2022-10-31 16:34:58 -04:00
Charlie Marsh	05867ef260	Set flake8-to-ruff release to workflow_dispatch	2022-10-31 16:25:09 -04:00
Charlie Marsh	0cd8b75f06	Rename release.yaml files	2022-10-31 16:23:52 -04:00
Charlie Marsh	5f07e1d6b5	Fix release.yaml task names	2022-10-31 16:22:25 -04:00
Charlie Marsh	1ce4585c88	Add a separate release job for flake8-to-ruff (#529 )	2022-10-31 16:21:38 -04:00
Charlie Marsh	f3f010cdf5	Move flake8-to-ruff to a separate crate (#528 )	2022-10-31 14:22:07 -04:00
Charlie Marsh	7e5e03fb15	Add a Flake8-to-Ruff configuration conversion tool (#527 )	2022-10-31 11:34:40 -04:00
Charlie Marsh	062c41b6f5	Bump version to 0.0.93	2022-10-31 09:20:39 -04:00
Charlie Marsh	78889efa37	Modify public API to return Check rather than Message (#524 )	2022-10-31 09:20:14 -04:00
Charlie Marsh	97fc281779	Remove erroneous foo.py file	2022-10-30 19:19:49 -04:00
Charlie Marsh	138b06c98a	Bump version to 0.0.92	2022-10-30 18:04:30 -04:00
Charlie Marsh	2415d73260	Remove RustPython fork (#523 )	2022-10-30 18:04:05 -04:00
Charlie Marsh	b060ae2f22	Move SourceCodeLocator to its own module (#522 )	2022-10-30 15:51:59 -04:00
Charlie Marsh	9aa91d3d3c	Add a cargo bench for SourceCodeLocator (#521 )	2022-10-30 13:50:42 -04:00
Charlie Marsh	dcedb801e5	Tweak a few check messages (#520 )	2022-10-30 13:13:37 -04:00
Charlie Marsh	d3e7fdabb5	Implement consistent newline handling for SourceCodeLocator (#519 )	2022-10-30 13:11:08 -04:00
Charlie Marsh	dfa5a4f0f7	Fix 9/32 flake8-bugbear reference	2022-10-30 13:03:39 -04:00
Charlie Marsh	58a2d600da	Avoid flagging D202 for inner functions and classes (#518 )	2022-10-30 13:02:55 -04:00
Harutaka Kawamura	7ecbfe4f6a	Implement B006 (#515 )	2022-10-30 12:57:57 -04:00
Charlie Marsh	d8248104a7	Avoid re-indenting empty lines in D207 (#517 )	2022-10-30 09:41:54 -04:00
Charlie Marsh	6eb09122c0	Add final newline in SourceCodeLocator	2022-10-29 19:23:16 -04:00
Charlie Marsh	f84c1f1fa1	Bump version to 0.0.91	2022-10-29 18:49:26 -04:00
Charlie Marsh	3aa9528229	Avoid flake8-comprehensions errors for dicts with kwargs (#512 )	2022-10-29 18:49:06 -04:00
Charlie Marsh	5a3f06bab1	Bump version to 0.0.90	2022-10-29 18:34:38 -04:00
Charlie Marsh	db59d5b558	Use a single SourceCodeLocator everywhere (#510 )	2022-10-29 18:23:24 -04:00
Charlie Marsh	2fcbf3ab62	Simplify SourceCodeLocator offset computation (#509 )	2022-10-29 18:13:42 -04:00
Anders Kaseorg	fa9b10be72	Remove leading space from C416 message (#508 )	2022-10-29 17:40:50 -04:00
Charlie Marsh	c495cef529	Move pyproject.toml logging to debug (#506 )	2022-10-29 17:07:46 -04:00
Charlie Marsh	c0c8dff6ce	Implement configuration options for pep8-naming (#505 )	2022-10-29 17:00:30 -04:00
Charlie Marsh	80b00cc89f	Add error code categories to table of contents (#504 )	2022-10-29 16:39:55 -04:00
Charlie Marsh	934db3d179	Bump version to 0.0.89	2022-10-29 15:39:17 -04:00
Charlie Marsh	6a040a0405	Update checks_gen.rs	2022-10-29 15:39:02 -04:00
Harutaka Kawamura	2821ef0f69	Implement B013 (#503 )	2022-10-29 15:36:29 -04:00
Harutaka Kawamura	343d931ddb	Ignore unittest methods and functions in N802 (#502 )	2022-10-29 15:36:09 -04:00
Harutaka Kawamura	3fc257f71b	Implement N806, 815, 816, 818 (#501 )	2022-10-29 15:35:56 -04:00
Charlie Marsh	6dbb0a17e9	Update README to reflect selection groups	2022-10-28 19:15:46 -04:00
Charlie Marsh	ae5ad6a4ac	Bump version to 0.0.88	2022-10-28 19:11:04 -04:00
Charlie Marsh	549af6c584	Regenerate CheckCodePrefix	2022-10-28 19:10:45 -04:00
Charlie Marsh	9a799eb4e6	Bump version to 0.0.87	2022-10-28 19:00:03 -04:00
Anders Kaseorg	f260b873b6	Fix “not a char boundary” error with Unicode in extract_quote (#497 )	2022-10-28 18:59:12 -04:00
Charlie Marsh	782a90b584	Add tests for resolve_codes (#498 )	2022-10-28 18:58:46 -04:00
Charlie Marsh	7df903dc4d	Move around and rename some of the Settings structs (#496 )	2022-10-28 18:46:54 -04:00
Charlie Marsh	8fc5e91ec7	Enable prefix-based check code selection (#493 )	2022-10-28 18:19:57 -04:00
Charlie Marsh	9ca1a2c273	Fix failing pyproject.toml test	2022-10-28 18:13:07 -04:00
Charlie Marsh	86265c1d7c	Implement the `flake8-quotes` plugin (#495 )	2022-10-28 17:52:11 -04:00
Charlie Marsh	a057c9a323	Move invalid_escape_sequence into pycodestyle (#494 )	2022-10-28 12:20:11 -04:00
Trevor Gross	2e63bb6dcb	Update hook id in README and in .pre-commit-config.yaml (#492 )	2022-10-27 17:32:52 -04:00
Charlie Marsh	1b5db80b32	Update pre-commit invocation in README.md	2022-10-27 17:19:22 -04:00
Charlie Marsh	3f20cea402	Bump version to 0.0.86	2022-10-27 13:09:57 -04:00
Charlie Marsh	389fe1ff64	Avoid auto-fixing unused imports in __init__.py (#489 )	2022-10-27 13:08:04 -04:00
Charlie Marsh	bad2d7ba85	Add example of per-file ignores to the README (#488 )	2022-10-27 12:58:52 -04:00
Charlie Marsh	416aa298ac	Allow whitespace in per-file ignore patterns (#487 )	2022-10-27 12:55:28 -04:00
Charlie Marsh	a535b1adbf	Replace compliance comments with check codes (#485 )	2022-10-27 09:32:18 -04:00
				`@@ -0,0 +1 @@`
				`this_should_not_be_linted = "double quote string" # noqa`
				`@@ -0,0 +1 @@`
				`this_should_not_be_linted = 'single quote string' # noqa`