Use assignment expressions 20 (#57969)

homeassistant/components/mqtt/__init__.py

@@ -598,8 +598,7 @@ class MQTT:
         """
         self = hass.data[DATA_MQTT]
 
-        conf = hass.data.get(DATA_MQTT_CONFIG)
-        if conf is None:
+        if (conf := hass.data.get(DATA_MQTT_CONFIG)) is None:
             conf = CONFIG_SCHEMA({DOMAIN: dict(entry.data)})[DOMAIN]
 
         self.conf = _merge_config(entry, conf)
@@ -622,8 +621,7 @@ class MQTT:
         else:
             proto = mqtt.MQTTv311
 
-        client_id = self.conf.get(CONF_CLIENT_ID)
-        if client_id is None:
+        if (client_id := self.conf.get(CONF_CLIENT_ID)) is None:
             # PAHO MQTT relies on the MQTT server to generate random client IDs.
             # However, that feature is not mandatory so we generate our own.
             client_id = mqtt.base62(uuid.uuid4().int, padding=22)
@@ -637,9 +635,7 @@ class MQTT:
         if username is not None:
             self._mqttc.username_pw_set(username, password)
 
-        certificate = self.conf.get(CONF_CERTIFICATE)
-
-        if certificate == "auto":
+        if (certificate := self.conf.get(CONF_CERTIFICATE)) == "auto":
             certificate = certifi.where()
 
         client_key = self.conf.get(CONF_CLIENT_KEY)
@@ -1002,8 +998,7 @@ async def websocket_remove_device(hass, connection, msg):
     device_id = msg["device_id"]
     dev_registry = await hass.helpers.device_registry.async_get_registry()
 
-    device = dev_registry.async_get(device_id)
-    if not device:
+    if not (device := dev_registry.async_get(device_id)):
         connection.send_error(
             msg["id"], websocket_api.const.ERR_NOT_FOUND, "Device not found"
         )

homeassistant/components/mqtt/alarm_control_panel.py

@@ -205,8 +205,7 @@ class MqttAlarm(MqttEntity, alarm.AlarmControlPanelEntity):
     @property
     def code_format(self):
         """Return one or more digits/characters."""
-        code = self._config.get(CONF_CODE)
-        if code is None:
+        if (code := self._config.get(CONF_CODE)) is None:
             return None
         if code == REMOTE_CODE or (isinstance(code, str) and re.search("^\\d+$", code)):
             return alarm.FORMAT_NUMBER

homeassistant/components/mqtt/discovery.py

@@ -142,8 +142,7 @@ async def async_start(  # noqa: C901
                         payload[key] = f"{value[:-1]}{base}"
             if payload.get(CONF_AVAILABILITY):
                 for availability_conf in payload[CONF_AVAILABILITY]:
-                    topic = availability_conf.get(CONF_TOPIC)
-                    if topic:
+                    if topic := availability_conf.get(CONF_TOPIC):
                         if topic[0] == TOPIC_BASE:
                             availability_conf[CONF_TOPIC] = f"{base}{topic[1:]}"
                         if topic[-1] == TOPIC_BASE:

homeassistant/components/mqtt/light/schema_basic.py

@@ -826,8 +826,7 @@ class MqttLight(MqttEntity, LightEntity, RestoreEntity):
 
         def render_rgbx(color, template, color_mode):
             """Render RGBx payload."""
-            tpl = self._command_templates[template]
-            if tpl:
+            if tpl := self._command_templates[template]:
                 keys = ["red", "green", "blue"]
                 if color_mode == COLOR_MODE_RGBW:
                     keys.append("white")