Update code

source/_cookbook/python_component_mqtt_basic.markdown

@@ -22,7 +22,7 @@ This example follows a topic on MQTT and updates the state of an entity to the l
 import homeassistant.loader as loader
 
 # The domain of your component. Should be equal to the name of your component.
-DOMAIN = "hello_mqtt"
+DOMAIN = 'hello_mqtt'
 
 # List of component names (string) your component depends upon.
 DEPENDENCIES = ['mqtt']
@@ -40,7 +40,7 @@ def setup(hass, config):
 
     # Listener to be called when we receive a message.
     def message_received(topic, payload, qos):
-        """A new MQTT message has been received."""
+        """Handle new MQTT messages."""
         hass.states.set(entity_id, payload)
 
     # Subscribe our listener to a topic.

source/_cookbook/python_component_simple_alarm.markdown

@@ -39,35 +39,35 @@ from homeassistant.components import device_tracker, light, notify
 from homeassistant.helpers.event import track_state_change
 from homeassistant.const import STATE_ON, STATE_OFF, STATE_HOME, STATE_NOT_HOME
 
-DOMAIN = "simple_alarm"
+_LOGGER = logging.getLogger(__name__)
+
+DOMAIN = 'simple_alarm"'
 
 DEPENDENCIES = ['group', 'device_tracker', 'light']
 
 # Attribute to tell which light has to flash when a known person comes home
 # If omitted will flash all.
-CONF_KNOWN_LIGHT = "known_light"
+CONF_KNOWN_LIGHT = 'known_light'
 
 # Attribute to tell which light has to flash when an unknown person comes home
 # If omitted will flash all.
-CONF_UNKNOWN_LIGHT = "unknown_light"
+CONF_UNKNOWN_LIGHT = 'unknown_light'
 
 # Services to test the alarms
-SERVICE_TEST_KNOWN_ALARM = "test_known"
-SERVICE_TEST_UNKNOWN_ALARM = "test_unknown"
+SERVICE_TEST_KNOWN_ALARM = 'test_known'
+SERVICE_TEST_UNKNOWN_ALARM = 'test_unknown'
 
 
 def setup(hass, config):
-    """ Sets up the simple alarms. """
-    logger = logging.getLogger(__name__)
-
+    """Set up the simple alarms."""
     light_ids = []
 
     for conf_key in (CONF_KNOWN_LIGHT, CONF_UNKNOWN_LIGHT):
         light_id = config[DOMAIN].get(conf_key, light.ENTITY_ID_ALL_LIGHTS)
 
         if hass.states.get(light_id) is None:
-            logger.error(
-                'Light id %s could not be found in state machine', light_id)
+            _LOGGER.error(
+                "Light id %s could not be found in state machine", light_id)
 
             return False
 
@@ -77,7 +77,7 @@ def setup(hass, config):
     known_light_id, unknown_light_id = light_ids
 
     if hass.states.get(device_tracker.ENTITY_ID_ALL_DEVICES) is None:
-        logger.error('No devices are being tracked, cannot setup alarm')
+        _LOGGER.error("No devices are being tracked, cannot setup alarm")
 
         return False