Add support for caching entity properties

homeassistant/components/template/image.py

@@ -94,9 +94,9 @@ def __init__(
     @property
     def entity_picture(self) -> str | None:
         """Return entity picture."""
-        # mypy doesn't know about fget: https://github.com/python/mypy/issues/6185
         if self._entity_picture_template:
-            return TemplateEntity.entity_picture.fget(self)  # type: ignore[attr-defined]
+            return TemplateEntity.entity_picture.__get__(self)
+        # mypy doesn't know about fget: https://github.com/python/mypy/issues/6185
         return ImageEntity.entity_picture.fget(self)  # type: ignore[attr-defined]
 
     @callback

homeassistant/components/weather/__init__.py

@@ -44,7 +44,7 @@
     PLATFORM_SCHEMA,
     PLATFORM_SCHEMA_BASE,
 )
-from homeassistant.helpers.entity import Entity, EntityDescription
+from homeassistant.helpers.entity import ABCCachedProperties, Entity, EntityDescription
 from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.helpers.entity_platform import EntityPlatform
 import homeassistant.helpers.issue_registry as ir
@@ -254,10 +254,10 @@ class WeatherEntityDescription(EntityDescription, frozen_or_thawed=True):
     """A class that describes weather entities."""
 
 
-class PostInitMeta(abc.ABCMeta):
+class PostInitMeta(ABCCachedProperties):
     """Meta class which calls __post_init__ after __new__ and __init__."""
 
-    def __call__(cls, *args: Any, **kwargs: Any) -> Any:
+    def __call__(cls, *args: Any, **kwargs: Any) -> Any:  # noqa: N805  ruff bug, ruff does not understand this is a metaclass
         """Create an instance."""
         instance: PostInit = super().__call__(*args, **kwargs)
         instance.__post_init__(*args, **kwargs)