Update code examples

source/_cookbook/python_component_basic_service.markdown

@@ -10,20 +10,20 @@ footer: true
 ha_category: Custom Python Component Examples
 ---
 
-This is a simple hello world example to show the basics of registering a service. To use this example, create the file `<config dir>/custom_components/hello_service.py` and copy the below example code.
+This is a simple "hello world" example to show the basics of registering a service. To use this example, create the file `<config dir>/custom_components/hello_service.py` and copy the below example code.
 
-Services can be called from automation and from the service developer tools in the frontend.
+Services can be called from automation and from the service "Developer tools" in the frontend.
 
 ```python
-# The domain of your component. Should be equal to the name of your component
+# The domain of your component. Should be equal to the name of your component.
-DOMAIN = "hello_service"
+DOMAIN = 'hello_service'
 
 ATTR_NAME = 'name'
 DEFAULT_NAME = 'World'
 
 
 def setup(hass, config):
-    """ Setup is called when Home Assistant is loading our component. """
+    """Setup is called when Home Assistant is loading our component."""
 
     def handle_hello(call):
         name = call.data.get(ATTR_NAME, DEFAULT_NAME)
@@ -32,7 +32,7 @@ def setup(hass, config):
 
     hass.services.register(DOMAIN, 'hello', handle_hello)
 
-    # return boolean to indicate that initialization was successful
+    # Return boolean to indicate that initialization was successfully.
     return True
 ```
 

source/_cookbook/python_component_basic_state.markdown

@@ -13,15 +13,15 @@ ha_category: Custom Python Component Examples
 This is a simple hello world example to show the basics for setting a state. To use this example, create the file `<config dir>/custom_components/hello_state.py` and copy the below example code.
 
 ```python
-# The domain of your component. Should be equal to the name of your component
+# The domain of your component. Should be equal to the name of your component.
-DOMAIN = "hello_state"
+DOMAIN = 'hello_state'
 
 CONF_NAME = 'name'
 DEFAULT_NAME = 'World'
 
 
 def setup(hass, config):
-    """ Setup is called when Home Assistant is loading our component. """
+    """Setup is called when Home Assistant is loading our component."""
 
     # Get the name from the configuration. Use DEFAULT_NAME if no name provided.
     name = config[DOMAIN].get(CONF_NAME, DEFAULT_NAME)
@@ -29,7 +29,7 @@ def setup(hass, config):
     # States are in the format DOMAIN.OBJECT_ID
     hass.states.set('hello_state.hello', name)
 
-    # return boolean to indicate that initialization was successful
+    # Return boolean to indicate that initialization was successfully.
     return True
 ```
 

source/_cookbook/python_component_mqtt_basic.markdown

@@ -21,10 +21,10 @@ This example follows a topic on MQTT and updates the state of an entity to the l
 ```python
 import homeassistant.loader as loader
 
-# The domain of your component. Should be equal to the name of your component
+# The domain of your component. Should be equal to the name of your component.
 DOMAIN = "hello_mqtt"
 
-# List of component names (string) your component depends upon
+# List of component names (string) your component depends upon.
 DEPENDENCIES = ['mqtt']
 
 
@@ -33,31 +33,31 @@ DEFAULT_TOPIC = 'home-assistant/hello_mqtt'
 
 
 def setup(hass, config):
-    """ Setup our hello_mqtt component. """
+    """Setup the Hello MQTT component."""
     mqtt = loader.get_component('mqtt')
     topic = config[DOMAIN].get('topic', DEFAULT_TOPIC)
     entity_id = 'hello_mqtt.last_message'
 
-    # Listener to be called when we receive a message
+    # Listener to be called when we receive a message.
     def message_received(topic, payload, qos):
-        """ A new MQTT message has been received. """
+        """A new MQTT message has been received."""
         hass.states.set(entity_id, payload)
 
-    # Subscribe our listener to a topic
+    # Subscribe our listener to a topic.
     mqtt.subscribe(hass, topic, message_received)
 
     # Set the intial state
     hass.states.set(entity_id, 'No messages')
 
-    # Service to publish a message on MQTT
+    # Service to publish a message on MQTT.
     def set_state_service(call):
-        """ Service to send a message. """
+        """Service to send a message."""
         mqtt.publish(hass, topic, call.data.get('new_state'))
 
-    # Register our service with Home Assistant
+    # Register our service with Home Assistant.
     hass.services.register(DOMAIN, 'set_state', set_state_service)
 
-    # return boolean to indicate that initialization was successful
+    # Return boolean to indicate that initialization was successfully.
     return True
 ```