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Improve type annotations of cached_property backport (#95309)

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Erik Montnemery 2023-06-27 01:36:01 +02:00 committed by GitHub
parent 9fe24c54e9
commit 398dbed72e
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1 changed files with 13 additions and 3 deletions
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16
homeassistant/backports/functools.py
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@ -3,7 +3,9 @@ from __future__ import annotations
from collections.abc import Callable from collections.abc import Callable
from types import GenericAlias from types import GenericAlias
from typing import Any, Generic, TypeVar, cast from typing import Any, Generic, TypeVar, overload
from typing_extensions import Self
_T = TypeVar("_T") _T = TypeVar("_T")
_R = TypeVar("_R") _R = TypeVar("_R")
@ -31,10 +33,18 @@ class cached_property(Generic[_T, _R]): # pylint: disable=invalid-name
f"({self.attrname!r} and {name!r})." f"({self.attrname!r} and {name!r})."
) )
def __get__(self, instance: _T | None, owner: type[_T] | None = None) -> _R: @overload
def __get__(self, instance: None, owner: type[_T]) -> Self:
...
@overload
def __get__(self, instance: _T, owner: type[_T]) -> _R:
...
def __get__(self, instance: _T | None, owner: type[_T] | None = None) -> _R | Self:
"""Get.""" """Get."""
if instance is None: if instance is None:
return cast(_R, self) return self
if self.attrname is None: if self.attrname is None:
raise TypeError( raise TypeError(
"Cannot use cached_property instance without calling __set_name__ on it." "Cannot use cached_property instance without calling __set_name__ on it."