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Improve type annotations

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This commit is contained in:
Erik 2023-06-26 23:28:39 +02:00
parent c71768445b
commit dd15059cfb
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."