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Improve the signature of type.__subclasses__ #16299

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Merged
JelleZijlstra merged 2 commits into from
Aug 25, 2026
+9 −1
Merged

Improve the signature of type.__subclasses__ #16299

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f895a3a
Improve the signature of `type.__subclasses__`
AlexWaygood Aug 25, 2026
4fe13b6
add tests
AlexWaygood Aug 25, 2026
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8 changes: 8 additions & 0 deletions stdlib/@tests/test_cases/builtins/check_type.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,12 @@
from typing_extensions import assert_type


class Meta(type): ...


call = Meta.__dict__["__call__"]

# Regression tests for https://github.com/python/typeshed/pull/16299
assert_type(int.__subclasses__(), list[type[int]])
assert_type(str.__subclasses__(), list[type[str]])
assert_type(BaseException.__subclasses__(), list[type[BaseException]])
2 changes: 1 addition & 1 deletion stdlib/builtins.pyi
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Expand Up @@ -218,7 +218,7 @@ class type:
) -> _typeshed.Self: ...

def __call__(self, *args: Any, **kwds: Any) -> Any: ...
def __subclasses__(self: _typeshed.Self) -> list[_typeshed.Self]: ...
def __subclasses__(self: type[_T]) -> list[type[_T]]: ...
# Note: the documentation doesn't specify what the return type is, the standard
# implementation seems to be returning a list.
def mro(self) -> list[type]: ...
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