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[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)

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Alex Waygood
2025-10-27 11:19:12 +00:00
committed by GitHub
parent 3c7f56f582
commit db0e921db1
32 changed files with 780 additions and 599 deletions
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24
crates/ty_python_semantic/resources/mdtest/subscript/tuple.md
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@@ -125,13 +125,14 @@ The stdlib API `os.stat` is a commonly used API that returns an instance of a tu
```py
import os
import stat
from ty_extensions import reveal_mro
reveal_type(os.stat("my_file.txt")) # revealed: stat_result
reveal_type(os.stat("my_file.txt")[stat.ST_MODE]) # revealed: int
reveal_type(os.stat("my_file.txt")[stat.ST_ATIME]) # revealed: int | float
# revealed: tuple[<class 'stat_result'>, <class 'structseq[int | float]'>, <class 'tuple[int, int, int, int, int, int, int, int | float, int | float, int | float]'>, <class 'Sequence[int | float]'>, <class 'Reversible[int | float]'>, <class 'Collection[int | float]'>, <class 'Iterable[int | float]'>, <class 'Container[int | float]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(os.stat_result.__mro__)
# revealed: (<class 'stat_result'>, <class 'structseq[int | float]'>, <class 'tuple[int, int, int, int, int, int, int, int | float, int | float, int | float]'>, <class 'Sequence[int | float]'>, <class 'Reversible[int | float]'>, <class 'Collection[int | float]'>, <class 'Iterable[int | float]'>, <class 'Container[int | float]'>, typing.Protocol, typing.Generic, <class 'object'>)
reveal_mro(os.stat_result)
# There are no specific overloads for the `float` elements in `os.stat_result`,
# because the fallback `(self, index: SupportsIndex, /) -> int | float` overload
@@ -336,15 +337,17 @@ python-version = "3.9"
```
```py
from ty_extensions import reveal_mro
class A(tuple[int, str]): ...
# revealed: tuple[<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(A.__mro__)
# revealed: (<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>)
reveal_mro(A)
class C(tuple): ...
# revealed: tuple[<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(C.__mro__)
# revealed: (<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>)
reveal_mro(C)
```
## `typing.Tuple`
@@ -376,16 +379,17 @@ python-version = "3.9"
```py
from typing import Tuple
from ty_extensions import reveal_mro
class A(Tuple[int, str]): ...
# revealed: tuple[<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(A.__mro__)
# revealed: (<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>)
reveal_mro(A)
class C(Tuple): ...
# revealed: tuple[<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(C.__mro__)
# revealed: (<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>)
reveal_mro(C)
```
### Union subscript access