Use attr** in meteoalarm (#61895)

Co-authored-by: epenet <epenet@users.noreply.github.com>

homeassistant/components/meteoalarm/binary_sensor.py

@@ -6,11 +6,11 @@ from meteoalertapi import Meteoalert
 import voluptuous as vol
 
 from homeassistant.components.binary_sensor import (
-    DEVICE_CLASS_SAFETY,
     PLATFORM_SCHEMA,
+    BinarySensorDeviceClass,
     BinarySensorEntity,
 )
-from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
+from homeassistant.const import CONF_NAME
 import homeassistant.helpers.config_validation as cv
 import homeassistant.util.dt as dt_util
 
@@ -56,43 +56,23 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 class MeteoAlertBinarySensor(BinarySensorEntity):
     """Representation of a MeteoAlert binary sensor."""
 
+    _attr_attribution = ATTRIBUTION
+    _attr_device_class = BinarySensorDeviceClass.SAFETY
+
     def __init__(self, api, name):
         """Initialize the MeteoAlert binary sensor."""
-        self._name = name
-        self._attributes = {}
-        self._state = None
+        self._attr_name = name
         self._api = api
 
-    @property
-    def name(self):
-        """Return the name of the binary sensor."""
-        return self._name
-
-    @property
-    def is_on(self):
-        """Return the status of the binary sensor."""
-        return self._state
-
-    @property
-    def extra_state_attributes(self):
-        """Return the state attributes."""
-        self._attributes[ATTR_ATTRIBUTION] = ATTRIBUTION
-        return self._attributes
-
-    @property
-    def device_class(self):
-        """Return the device class of this binary sensor."""
-        return DEVICE_CLASS_SAFETY
-
     def update(self):
         """Update device state."""
-        self._attributes = {}
-        self._state = False
+        self._attr_extra_state_attributes = None
+        self._attr_is_on = False
 
         if alert := self._api.get_alert():
             expiration_date = dt_util.parse_datetime(alert["expires"])
             now = dt_util.utcnow()
 
             if expiration_date > now:
-                self._attributes = alert
-                self._state = True
+                self._attr_extra_state_attributes = alert
+                self._attr_is_on = True