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Adding descriptor methods to _SimpleCData by DrInfiniteExplorer · Pull Request #11272 · python/typeshed · GitHub

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Adding descriptor methods to _SimpleCData #11272

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Adding descriptor methods to _SimpleCData #11272

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3855297
Adding descriptor methods to _SimpleCData
DrInfiniteExplorer Jan 14, 2024
4a4820e
Not sure if this is the right way to go about it. Would be happy with…
DrInfiniteExplorer Jan 14, 2024
135c443
Adding regression test for ctypes
DrInfiniteExplorer Jan 14, 2024
1d340f4
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jan 14, 2024
c0f5d10
Merge branch 'main' into main
AlexWaygood Feb 5, 2024
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7 changes: 7 additions & 0 deletions stdlib/_ctypes.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,13 @@ class _SimpleCData(_CData, Generic[_T]):
# The TypeVar can be unsolved here,
# but we can't use overloads without creating many, many mypy false-positive errors
def __init__(self, value: _T = ...) -> None: ... # pyright: ignore[reportInvalidTypeVarUse]
@overload
def __get__(self, __instance: None, __owner: type[Any] | None) -> Self: ...
@overload
def __get__(self, __instance: Any, __owner: type[_StructUnionBase]) -> _T: ...
@overload
def __get__(self, __instance: Any, __owner: type[Any] | None) -> Self: ...
def __set__(self, __instance: Any, __value: _T) -> None: ...

class _CanCastTo(_CData): ...
class _PointerLike(_CanCastTo): ...
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45 changes: 45 additions & 0 deletions test_cases/stdlib/check_ctypes.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
# pyright: reportUninitializedInstanceVariable=false

from __future__ import annotations

import ctypes
from typing import Any
from typing_extensions import assert_type


class Annotated(ctypes.Structure):
_fields_ = [("i", ctypes.c_int), ("f", ctypes.c_float)]
i: ctypes.c_int
f: ctypes.c_float


class NoAnnotation(ctypes.Structure):
_fields_ = [("i", ctypes.c_int), ("f", ctypes.c_float)]


class NonCType:
i: ctypes.c_int
f: ctypes.c_float


assert_type(ctypes.c_int().value, int)
ctypes.c_int() + 2 # type: ignore

assert_type(ctypes.c_float().value, float)
ctypes.c_float() + 2 # type: ignore

# All passes; all access are Any
assert_type(NoAnnotation().x + 2, Any)
assert_type(NoAnnotation().vec.x + 2, Any)

Annotated.x.value + 2 # type: ignore
Annotated.x + 2 # type: ignore
assert_type(Annotated().i, int)
Annotated().i.value + 2 # type: ignore
assert_type(Annotated().f, float)
Annotated().f.value + 3.14 # type: ignore

assert_type(NonCType.i.value, int)
NonCType.i + 2 # type: ignore
NonCType().i + 2 # type: ignore
assert_type(NonCType().i.value, int)
4 changes: 4 additions & 0 deletions tests/stubtest_allowlists/py3_common.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,8 @@ _collections_abc.KeysView.__reversed__
_collections_abc.ValuesView.__reversed__
_csv.Dialect.__init__ # C __init__ signature is inaccurate
_ctypes.CFuncPtr # stubtest erroneously thinks it can't be subclassed
_ctypes._SimpleCData.__get__ # Does not exist on runtime object
_ctypes._SimpleCData.__set__ # Does not exist on runtime object
_threading_local.local.__new__
ast.Bytes.__new__
ast.Ellipsis.__new__
Expand All @@ -37,6 +39,8 @@ ctypes.memmove # CFunctionType
ctypes.memset # CFunctionType
ctypes.string_at # docstring argument name is wrong
ctypes.wstring_at # docstring argument name is wrong
ctypes._SimpleCData.__get__ # Does not exist on runtime object
ctypes._SimpleCData.__set__ # Does not exist on runtime object
fractions.Fraction.__new__ # overload is too complicated for stubtest to resolve
ftplib.FTP.trust_server_pasv_ipv4_address # Dangerous to use, intentionally undocumented, intentionally missing from typeshed. #6154
functools.cached_property.__set__ # Stub is a white lie; see comments in the stub
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