Fix met TypeVar usage (#68152)

* Fix met TypeVar usage

* Change format_condition

homeassistant/components/met/__init__.py

@@ -82,12 +82,12 @@ async def async_unload_entry(hass: HomeAssistant, config_entry: ConfigEntry) ->
     return unload_ok
 
 
-class MetDataUpdateCoordinator(DataUpdateCoordinator):
+class MetDataUpdateCoordinator(DataUpdateCoordinator["MetWeatherData"]):
     """Class to manage fetching Met data."""
 
     def __init__(self, hass: HomeAssistant, config_entry: ConfigEntry) -> None:
         """Initialize global Met data updater."""
-        self._unsub_track_home: Callable | None = None
+        self._unsub_track_home: Callable[[], None] | None = None
         self.weather = MetWeatherData(
             hass, config_entry.data, hass.config.units.is_metric
         )
@@ -137,8 +137,8 @@ class MetWeatherData:
         self._is_metric = is_metric
         self._weather_data: metno.MetWeatherData
         self.current_weather_data: dict = {}
-        self.daily_forecast = None
-        self.hourly_forecast = None
+        self.daily_forecast: list[dict] = []
+        self.hourly_forecast: list[dict] = []
         self._coordinates: dict[str, str] | None = None
 
     def set_coordinates(self) -> bool:

homeassistant/components/met/weather.py

@@ -40,15 +40,12 @@ from homeassistant.helpers.device_registry import DeviceEntryType
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
-from homeassistant.helpers.update_coordinator import (
-    CoordinatorEntity,
-    DataUpdateCoordinator,
-    T,
-)
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
 from homeassistant.util.distance import convert as convert_distance
 from homeassistant.util.pressure import convert as convert_pressure
 from homeassistant.util.speed import convert as convert_speed
 
+from . import MetDataUpdateCoordinator, MetWeatherData
 from .const import (
     ATTR_FORECAST_PRECIPITATION,
     ATTR_MAP,
@@ -109,7 +106,7 @@ async def async_setup_entry(
     async_add_entities: AddEntitiesCallback,
 ) -> None:
     """Add a weather entity from a config_entry."""
-    coordinator = hass.data[DOMAIN][config_entry.entry_id]
+    coordinator: MetDataUpdateCoordinator = hass.data[DOMAIN][config_entry.entry_id]
     async_add_entities(
         [
             MetWeather(
@@ -130,12 +127,14 @@ def format_condition(condition: str) -> str:
     return condition
 
 
-class MetWeather(CoordinatorEntity, WeatherEntity):
+class MetWeather(CoordinatorEntity[MetWeatherData], WeatherEntity):
     """Implementation of a Met.no weather condition."""
 
+    coordinator: MetDataUpdateCoordinator
+
     def __init__(
         self,
-        coordinator: DataUpdateCoordinator[T],
+        coordinator: MetDataUpdateCoordinator,
         config: MappingProxyType[str, Any],
         is_metric: bool,
         hourly: bool,
@@ -187,6 +186,8 @@ class MetWeather(CoordinatorEntity, WeatherEntity):
     def condition(self) -> str | None:
         """Return the current condition."""
         condition = self.coordinator.data.current_weather_data.get("condition")
+        if condition is None:
+            return None
         return format_condition(condition)
 
     @property