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Constrain memoryview type var to allowed types #13683

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Constrain memoryview type var to allowed types #13683

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f99a87a
Constrain memoryview type var to allowed types
srittau Mar 20, 2025
0f9e134
Merge branch 'main' into generic-memoryview
srittau Nov 5, 2025
6a7f55a
Change memoryview generic default to Any
srittau Nov 5, 2025
010ca90
Silence mypy
srittau Nov 5, 2025
ffb1e98
Fix, reference mypy issue
srittau Nov 5, 2025
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5 changes: 3 additions & 2 deletions stdlib/builtins.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,8 @@ if sys.version_info >= (3, 14):
from _typeshed import AnnotateFunc

_T = TypeVar("_T")
_I = TypeVar("_I", default=int)
# Type ignore needed because of https://github.com/python/mypy/issues/20184.
_I = TypeVar("_I", int, bytes, float, bool, default=Any) # type: ignore[misc] # possibly memoryview types
_T_co = TypeVar("_T_co", covariant=True)
_T_contra = TypeVar("_T_contra", contravariant=True)
_R_co = TypeVar("_R_co", covariant=True)
Expand Down Expand Up @@ -919,7 +920,7 @@ class memoryview(Sequence[_I]):
@overload
def cast(self, format: Literal["?"], shape: list[int] | tuple[int, ...] = ...) -> memoryview[bool]: ...
@overload
def cast(self, format: _IntegerFormats, shape: list[int] | tuple[int, ...] = ...) -> memoryview: ...
def cast(self, format: _IntegerFormats, shape: list[int] | tuple[int, ...] = ...) -> memoryview[int]: ...
@overload
def __getitem__(self, key: SupportsIndex | tuple[SupportsIndex, ...], /) -> _I: ...
@overload
Expand Down