Improve type hints in demo [1/3] (#77180)

homeassistant/components/demo/calendar.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 
 import copy
 import datetime
+from typing import Any
 
 from homeassistant.components.calendar import (
     CalendarEntity,
@@ -60,18 +61,13 @@ class DemoCalendar(CalendarEntity):
     def __init__(self, event: CalendarEvent, name: str) -> None:
         """Initialize demo calendar."""
         self._event = event
-        self._name = name
+        self._attr_name = name
 
     @property
     def event(self) -> CalendarEvent:
         """Return the next upcoming event."""
         return self._event
 
-    @property
-    def name(self) -> str:
-        """Return the name of the entity."""
-        return self._name
-
     async def async_get_events(
         self,
         hass: HomeAssistant,
@@ -87,7 +83,7 @@ class LegacyDemoCalendar(CalendarEventDevice):
 
     def __init__(self, name: str) -> None:
         """Initialize demo calendar."""
-        self._name = name
+        self._attr_name = name
         one_hour_from_now = dt_util.now() + datetime.timedelta(minutes=30)
         self._event = {
             "start": {"dateTime": one_hour_from_now.isoformat()},
@@ -102,16 +98,16 @@ class LegacyDemoCalendar(CalendarEventDevice):
         }
 
     @property
-    def event(self):
+    def event(self) -> dict[str, Any]:
         """Return the next upcoming event."""
         return self._event
 
-    @property
-    def name(self) -> str:
-        """Return the name of the entity."""
-        return self._name
-
-    async def async_get_events(self, hass, start_date, end_date):
+    async def async_get_events(
+        self,
+        hass: HomeAssistant,
+        start_date: datetime.datetime,
+        end_date: datetime.datetime,
+    ) -> list[dict[str, Any]]:
         """Get all events in a specific time frame."""
         event = copy.copy(self.event)
         event["title"] = event["summary"]