Update/add docstrings (PEP257)

homeassistant/components/sensor/efergy.py

@@ -1,6 +1,4 @@
 """
-homeassistant.components.sensor.efergy
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Monitors home energy use as measured by an efergy engage hub using its
 (unofficial, undocumented) API.
 
@@ -23,7 +21,7 @@ SENSOR_TYPES = {
 
 
 def setup_platform(hass, config, add_devices, discovery_info=None):
-    """ Sets up the Efergy sensor. """
+    """Sets up the Efergy sensor."""
     app_token = config.get("app_token")
     if not app_token:
         _LOGGER.error(
@@ -48,7 +46,7 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
 
 # pylint: disable=too-many-instance-attributes
 class EfergySensor(Entity):
-    """ Implements an Efergy sensor. """
+    """Implements an Efergy sensor."""
 
     # pylint: disable=too-many-arguments
     def __init__(self, sensor_type, app_token, utc_offset, period, currency):
@@ -66,21 +64,21 @@ class EfergySensor(Entity):
 
     @property
     def name(self):
-        """ Returns the name. """
+        """Returns the name of the sensor."""
         return self._name
 
     @property
     def state(self):
-        """ Returns the state of the device. """
+        """Returns the state of the sensor."""
         return self._state
 
     @property
     def unit_of_measurement(self):
-        """ Unit of measurement of this entity, if any. """
+        """Unit of measurement of this entity, if any."""
         return self._unit_of_measurement
 
     def update(self):
-        """ Gets the Efergy monitor data from the web service. """
+        """Gets the Efergy monitor data from the web service."""
         try:
             if self.type == 'instant_readings':
                 url_string = _RESOURCE + 'getInstant?token=' + self.app_token