diff --git a/homeassistant/components/arest/binary_sensor.py b/homeassistant/components/arest/binary_sensor.py
index 669a28b7078..caabe3333f8 100644
--- a/homeassistant/components/arest/binary_sensor.py
+++ b/homeassistant/components/arest/binary_sensor.py
@@ -1,18 +1,18 @@
 """Support for an exposed aREST RESTful API of a device."""
-import logging
 from datetime import timedelta
+import logging
 
 import requests
 import voluptuous as vol
 
 from homeassistant.components.binary_sensor import (
-    BinarySensorDevice,
-    PLATFORM_SCHEMA,
     DEVICE_CLASSES_SCHEMA,
+    PLATFORM_SCHEMA,
+    BinarySensorDevice,
 )
-from homeassistant.const import CONF_RESOURCE, CONF_PIN, CONF_NAME, CONF_DEVICE_CLASS
-from homeassistant.util import Throttle
+from homeassistant.const import CONF_DEVICE_CLASS, CONF_NAME, CONF_PIN, CONF_RESOURCE
 import homeassistant.helpers.config_validation as cv
+from homeassistant.util import Throttle
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/homeassistant/components/arest/sensor.py b/homeassistant/components/arest/sensor.py
index 2416eeb0ebb..270a3cda269 100644
--- a/homeassistant/components/arest/sensor.py
+++ b/homeassistant/components/arest/sensor.py
@@ -1,22 +1,22 @@
 """Support for an exposed aREST RESTful API of a device."""
-import logging
 from datetime import timedelta
+import logging
 
 import requests
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
-    CONF_UNIT_OF_MEASUREMENT,
-    CONF_VALUE_TEMPLATE,
-    CONF_RESOURCE,
     CONF_MONITORED_VARIABLES,
     CONF_NAME,
+    CONF_RESOURCE,
+    CONF_UNIT_OF_MEASUREMENT,
+    CONF_VALUE_TEMPLATE,
 )
 from homeassistant.exceptions import TemplateError
+import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
-import homeassistant.helpers.config_validation as cv
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/homeassistant/components/arest/switch.py b/homeassistant/components/arest/switch.py
index e1a7edacb7e..b3db6684cf2 100644
--- a/homeassistant/components/arest/switch.py
+++ b/homeassistant/components/arest/switch.py
@@ -5,7 +5,7 @@ import logging
 import requests
 import voluptuous as vol
 
-from homeassistant.components.switch import SwitchDevice, PLATFORM_SCHEMA
+from homeassistant.components.switch import PLATFORM_SCHEMA, SwitchDevice
 from homeassistant.const import CONF_NAME, CONF_RESOURCE
 import homeassistant.helpers.config_validation as cv