77ae0ccf0f
## Summary Infer subscript expression types for bytes literals: ```py b = b"\x00abc\xff" reveal_type(b[0]) # revealed: Literal[b"\x00"] reveal_type(b[1]) # revealed: Literal[b"a"] reveal_type(b[-1]) # revealed: Literal[b"\xff"] reveal_type(b[-2]) # revealed: Literal[b"c"] reveal_type(b[False]) # revealed: Literal[b"\x00"] reveal_type(b[True]) # revealed: Literal[b"a"] ``` part of #13689 (https://github.com/astral-sh/ruff/issues/13689#issuecomment-2404285064) ## Test Plan - New Markdown-based tests (see `mdtest/subscript/bytes.md`) - Added missing test for `string_literal[bool_literal]`
803 B
803 B
Subscript on strings
Simple
s = "abcde"
reveal_type(s[0]) # revealed: Literal["a"]
reveal_type(s[1]) # revealed: Literal["b"]
reveal_type(s[-1]) # revealed: Literal["e"]
reveal_type(s[-2]) # revealed: Literal["d"]
reveal_type(s[False]) # revealed: Literal["a"]
reveal_type(s[True]) # revealed: Literal["b"]
a = s[8] # error: [index-out-of-bounds] "Index 8 is out of bounds for string `Literal["abcde"]` with length 5"
reveal_type(a) # revealed: Unknown
b = s[-8] # error: [index-out-of-bounds] "Index -8 is out of bounds for string `Literal["abcde"]` with length 5"
reveal_type(b) # revealed: Unknown
Function return
def int_instance() -> int: ...
a = "abcde"[int_instance()]
# TODO: Support overloads... Should be `str`
reveal_type(a) # revealed: @Todo