diff --git a/homeassistant/components/abode/__init__.py b/homeassistant/components/abode/__init__.py
index 71a1dcdd590..591bae1a9cf 100644
--- a/homeassistant/components/abode/__init__.py
+++ b/homeassistant/components/abode/__init__.py
@@ -17,7 +17,8 @@ REQUIREMENTS = ['abodepy==0.15.0']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by goabode.com"
+ATTRIBUTION = "Data provided by goabode.com"
+
 CONF_POLLING = 'polling'
 
 DOMAIN = 'abode'
@@ -280,7 +281,7 @@ class AbodeDevice(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'device_id': self._device.device_id,
             'battery_low': self._device.battery_low,
             'no_response': self._device.no_response,
@@ -327,7 +328,7 @@ class AbodeAutomation(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'automation_id': self._automation.automation_id,
             'type': self._automation.type,
             'sub_type': self._automation.sub_type
diff --git a/homeassistant/components/abode/alarm_control_panel.py b/homeassistant/components/abode/alarm_control_panel.py
index ec5038a7a84..838d09b73af 100644
--- a/homeassistant/components/abode/alarm_control_panel.py
+++ b/homeassistant/components/abode/alarm_control_panel.py
@@ -2,7 +2,7 @@
 import logging
 
 import homeassistant.components.alarm_control_panel as alarm
-from homeassistant.components.abode import CONF_ATTRIBUTION, AbodeDevice
+from homeassistant.components.abode import ATTRIBUTION, AbodeDevice
 from homeassistant.components.abode import DOMAIN as ABODE_DOMAIN
 from homeassistant.const import (
     ATTR_ATTRIBUTION, STATE_ALARM_ARMED_AWAY, STATE_ALARM_ARMED_HOME,
@@ -73,7 +73,7 @@ class AbodeAlarm(AbodeDevice, alarm.AlarmControlPanel):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'device_id': self._device.device_id,
             'battery_backup': self._device.battery,
             'cellular_backup': self._device.is_cellular,
diff --git a/homeassistant/components/arlo/__init__.py b/homeassistant/components/arlo/__init__.py
index 7e81836e522..cbb720778e5 100644
--- a/homeassistant/components/arlo/__init__.py
+++ b/homeassistant/components/arlo/__init__.py
@@ -15,7 +15,7 @@ REQUIREMENTS = ['pyarlo==0.2.3']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by arlo.netgear.com"
+ATTRIBUTION = "Data provided by arlo.netgear.com"
 
 DATA_ARLO = 'data_arlo'
 DEFAULT_BRAND = 'Netgear Arlo'
diff --git a/homeassistant/components/arlo/alarm_control_panel.py b/homeassistant/components/arlo/alarm_control_panel.py
index 8c21a448a23..931dfa1b15d 100644
--- a/homeassistant/components/arlo/alarm_control_panel.py
+++ b/homeassistant/components/arlo/alarm_control_panel.py
@@ -9,7 +9,7 @@ from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.components.alarm_control_panel import (
     AlarmControlPanel, PLATFORM_SCHEMA)
 from homeassistant.components.arlo import (
-    DATA_ARLO, CONF_ATTRIBUTION, SIGNAL_UPDATE_ARLO)
+    DATA_ARLO, ATTRIBUTION, SIGNAL_UPDATE_ARLO)
 from homeassistant.const import (
     ATTR_ATTRIBUTION, STATE_ALARM_ARMED_AWAY, STATE_ALARM_ARMED_HOME,
     STATE_ALARM_DISARMED, STATE_ALARM_ARMED_NIGHT)
@@ -117,7 +117,7 @@ class ArloBaseStation(AlarmControlPanel):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'device_id': self._base_station.device_id
         }
 
diff --git a/homeassistant/components/arlo/sensor.py b/homeassistant/components/arlo/sensor.py
index 3ad7b70a947..1c3cc933438 100644
--- a/homeassistant/components/arlo/sensor.py
+++ b/homeassistant/components/arlo/sensor.py
@@ -6,7 +6,7 @@ import voluptuous as vol
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.components.arlo import (
-    CONF_ATTRIBUTION, DEFAULT_BRAND, DATA_ARLO, SIGNAL_UPDATE_ARLO)
+    ATTRIBUTION, DEFAULT_BRAND, DATA_ARLO, SIGNAL_UPDATE_ARLO)
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
     ATTR_ATTRIBUTION, CONF_MONITORED_CONDITIONS, TEMP_CELSIUS,
@@ -177,7 +177,7 @@ class ArloSensor(Entity):
         """Return the device state attributes."""
         attrs = {}
 
-        attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
         attrs['brand'] = DEFAULT_BRAND
 
         if self._sensor_type != 'total_cameras':
diff --git a/homeassistant/components/binary_sensor/aurora.py b/homeassistant/components/binary_sensor/aurora.py
index 04b402722b2..cfd683346ff 100644
--- a/homeassistant/components/binary_sensor/aurora.py
+++ b/homeassistant/components/binary_sensor/aurora.py
@@ -19,8 +19,8 @@ from homeassistant.util import Throttle
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by the National Oceanic and Atmospheric" \
-                   "Administration"
+ATTRIBUTION = "Data provided by the National Oceanic and Atmospheric " \
+              "Administration"
 CONF_THRESHOLD = 'forecast_threshold'
 
 DEFAULT_DEVICE_CLASS = 'visible'
@@ -91,7 +91,7 @@ class AuroraSensor(BinarySensorDevice):
         if self.aurora_data:
             attrs['visibility_level'] = self.aurora_data.visibility_level
             attrs['message'] = self.aurora_data.is_visible_text
-            attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+            attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
         return attrs
 
     def update(self):
diff --git a/homeassistant/components/binary_sensor/ring.py b/homeassistant/components/binary_sensor/ring.py
index 5a65917f40b..79fc61a62d4 100644
--- a/homeassistant/components/binary_sensor/ring.py
+++ b/homeassistant/components/binary_sensor/ring.py
@@ -11,7 +11,7 @@ import voluptuous as vol
 import homeassistant.helpers.config_validation as cv
 
 from homeassistant.components.ring import (
-    CONF_ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DATA_RING)
+    ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DATA_RING)
 
 from homeassistant.const import (
     ATTR_ATTRIBUTION, CONF_ENTITY_NAMESPACE, CONF_MONITORED_CONDITIONS)
@@ -47,18 +47,14 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
     for device in ring.doorbells:  # ring.doorbells is doing I/O
         for sensor_type in config[CONF_MONITORED_CONDITIONS]:
             if 'doorbell' in SENSOR_TYPES[sensor_type][1]:
-                sensors.append(RingBinarySensor(hass,
-                                                device,
-                                                sensor_type))
+                sensors.append(RingBinarySensor(hass, device, sensor_type))
 
     for device in ring.stickup_cams:  # ring.stickup_cams is doing I/O
         for sensor_type in config[CONF_MONITORED_CONDITIONS]:
             if 'stickup_cams' in SENSOR_TYPES[sensor_type][1]:
-                sensors.append(RingBinarySensor(hass,
-                                                device,
-                                                sensor_type))
+                sensors.append(RingBinarySensor(hass, device, sensor_type))
+
     add_entities(sensors, True)
-    return True
 
 
 class RingBinarySensor(BinarySensorDevice):
@@ -69,8 +65,8 @@ class RingBinarySensor(BinarySensorDevice):
         super(RingBinarySensor, self).__init__()
         self._sensor_type = sensor_type
         self._data = data
-        self._name = "{0} {1}".format(self._data.name,
-                                      SENSOR_TYPES.get(self._sensor_type)[0])
+        self._name = "{0} {1}".format(
+            self._data.name, SENSOR_TYPES.get(self._sensor_type)[0])
         self._device_class = SENSOR_TYPES.get(self._sensor_type)[2]
         self._state = None
         self._unique_id = '{}-{}'.format(self._data.id, self._sensor_type)
@@ -99,7 +95,7 @@ class RingBinarySensor(BinarySensorDevice):
     def device_state_attributes(self):
         """Return the state attributes."""
         attrs = {}
-        attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
 
         attrs['device_id'] = self._data.id
         attrs['firmware'] = self._data.firmware
diff --git a/homeassistant/components/binary_sensor/uptimerobot.py b/homeassistant/components/binary_sensor/uptimerobot.py
index dbb83e53e9f..e48ac3039ae 100644
--- a/homeassistant/components/binary_sensor/uptimerobot.py
+++ b/homeassistant/components/binary_sensor/uptimerobot.py
@@ -19,7 +19,7 @@ _LOGGER = logging.getLogger(__name__)
 
 ATTR_TARGET = 'target'
 
-CONF_ATTRIBUTION = "Data provided by Uptime Robot"
+ATTRIBUTION = "Data provided by Uptime Robot"
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_API_KEY): cv.string,
@@ -78,7 +78,7 @@ class UptimeRobotBinarySensor(BinarySensorDevice):
     def device_state_attributes(self):
         """Return the state attributes of the binary sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_TARGET: self._target,
         }
 
diff --git a/homeassistant/components/camera/ring.py b/homeassistant/components/camera/ring.py
index da1119281b3..ce9ceb7b76f 100644
--- a/homeassistant/components/camera/ring.py
+++ b/homeassistant/components/camera/ring.py
@@ -13,7 +13,7 @@ import voluptuous as vol
 
 from homeassistant.helpers import config_validation as cv
 from homeassistant.components.ring import (
-    DATA_RING, CONF_ATTRIBUTION, NOTIFICATION_ID)
+    DATA_RING, ATTRIBUTION, NOTIFICATION_ID)
 from homeassistant.components.camera import Camera, PLATFORM_SCHEMA
 from homeassistant.components.ffmpeg import DATA_FFMPEG
 from homeassistant.const import ATTR_ATTRIBUTION, CONF_SCAN_INTERVAL
@@ -34,8 +34,7 @@ SCAN_INTERVAL = timedelta(seconds=90)
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Optional(CONF_FFMPEG_ARGUMENTS): cv.string,
-    vol.Optional(CONF_SCAN_INTERVAL, default=SCAN_INTERVAL):
-        cv.time_period,
+    vol.Optional(CONF_SCAN_INTERVAL, default=SCAN_INTERVAL): cv.time_period,
 })
 
 
@@ -106,7 +105,7 @@ class RingCam(Camera):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'device_id': self._camera.id,
             'firmware': self._camera.firmware,
             'kind': self._camera.kind,
diff --git a/homeassistant/components/digital_ocean/__init__.py b/homeassistant/components/digital_ocean/__init__.py
index d061dad6726..7975a6eea0d 100644
--- a/homeassistant/components/digital_ocean/__init__.py
+++ b/homeassistant/components/digital_ocean/__init__.py
@@ -22,7 +22,8 @@ ATTR_MEMORY = 'memory'
 ATTR_REGION = 'region'
 ATTR_VCPUS = 'vcpus'
 
-CONF_ATTRIBUTION = 'Data provided by Digital Ocean'
+ATTRIBUTION = 'Data provided by Digital Ocean'
+
 CONF_DROPLETS = 'droplets'
 
 DATA_DIGITAL_OCEAN = 'data_do'
diff --git a/homeassistant/components/digital_ocean/binary_sensor.py b/homeassistant/components/digital_ocean/binary_sensor.py
index 255f43b67ba..88df56cc629 100644
--- a/homeassistant/components/digital_ocean/binary_sensor.py
+++ b/homeassistant/components/digital_ocean/binary_sensor.py
@@ -9,7 +9,7 @@ from homeassistant.components.binary_sensor import (
 from homeassistant.components.digital_ocean import (
     CONF_DROPLETS, ATTR_CREATED_AT, ATTR_DROPLET_ID, ATTR_DROPLET_NAME,
     ATTR_FEATURES, ATTR_IPV4_ADDRESS, ATTR_IPV6_ADDRESS, ATTR_MEMORY,
-    ATTR_REGION, ATTR_VCPUS, CONF_ATTRIBUTION, DATA_DIGITAL_OCEAN)
+    ATTR_REGION, ATTR_VCPUS, ATTRIBUTION, DATA_DIGITAL_OCEAN)
 from homeassistant.const import ATTR_ATTRIBUTION
 
 _LOGGER = logging.getLogger(__name__)
@@ -71,7 +71,7 @@ class DigitalOceanBinarySensor(BinarySensorDevice):
     def device_state_attributes(self):
         """Return the state attributes of the Digital Ocean droplet."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_CREATED_AT: self.data.created_at,
             ATTR_DROPLET_ID: self.data.id,
             ATTR_DROPLET_NAME: self.data.name,
diff --git a/homeassistant/components/digital_ocean/switch.py b/homeassistant/components/digital_ocean/switch.py
index a10c961b8e4..9b5ddda3408 100644
--- a/homeassistant/components/digital_ocean/switch.py
+++ b/homeassistant/components/digital_ocean/switch.py
@@ -8,7 +8,7 @@ from homeassistant.components.switch import (SwitchDevice, PLATFORM_SCHEMA)
 from homeassistant.components.digital_ocean import (
     CONF_DROPLETS, ATTR_CREATED_AT, ATTR_DROPLET_ID, ATTR_DROPLET_NAME,
     ATTR_FEATURES, ATTR_IPV4_ADDRESS, ATTR_IPV6_ADDRESS, ATTR_MEMORY,
-    ATTR_REGION, ATTR_VCPUS, CONF_ATTRIBUTION, DATA_DIGITAL_OCEAN)
+    ATTR_REGION, ATTR_VCPUS, ATTRIBUTION, DATA_DIGITAL_OCEAN)
 from homeassistant.const import ATTR_ATTRIBUTION
 
 _LOGGER = logging.getLogger(__name__)
@@ -65,7 +65,7 @@ class DigitalOceanSwitch(SwitchDevice):
     def device_state_attributes(self):
         """Return the state attributes of the Digital Ocean droplet."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_CREATED_AT: self.data.created_at,
             ATTR_DROPLET_ID: self.data.id,
             ATTR_DROPLET_NAME: self.data.name,
diff --git a/homeassistant/components/hydrawise/__init__.py b/homeassistant/components/hydrawise/__init__.py
index 800d19d7efe..9c7baf6db2e 100644
--- a/homeassistant/components/hydrawise/__init__.py
+++ b/homeassistant/components/hydrawise/__init__.py
@@ -20,7 +20,8 @@ _LOGGER = logging.getLogger(__name__)
 
 ALLOWED_WATERING_TIME = [5, 10, 15, 30, 45, 60]
 
-CONF_ATTRIBUTION = "Data provided by hydrawise.com"
+ATTRIBUTION = "Data provided by hydrawise.com"
+
 CONF_WATERING_TIME = 'watering_minutes'
 
 NOTIFICATION_ID = 'hydrawise_notification'
@@ -141,6 +142,6 @@ class HydrawiseEntity(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'identifier': self.data.get('relay'),
         }
diff --git a/homeassistant/components/logi_circle/__init__.py b/homeassistant/components/logi_circle/__init__.py
index 50500f47e42..ef006ef8b4d 100644
--- a/homeassistant/components/logi_circle/__init__.py
+++ b/homeassistant/components/logi_circle/__init__.py
@@ -1,19 +1,19 @@
 """Support for Logi Circle devices."""
-import logging
 import asyncio
+import logging
 
-import voluptuous as vol
 import async_timeout
+import voluptuous as vol
 
+from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 import homeassistant.helpers.config_validation as cv
-from homeassistant.const import CONF_USERNAME, CONF_PASSWORD
 
 REQUIREMENTS = ['logi_circle==0.1.7']
 
 _LOGGER = logging.getLogger(__name__)
 _TIMEOUT = 15  # seconds
 
-CONF_ATTRIBUTION = "Data provided by circle.logi.com"
+ATTRIBUTION = "Data provided by circle.logi.com"
 
 NOTIFICATION_ID = 'logi_notification'
 NOTIFICATION_TITLE = 'Logi Circle Setup'
diff --git a/homeassistant/components/logi_circle/camera.py b/homeassistant/components/logi_circle/camera.py
index 51bd7c124a3..4f349dd986e 100644
--- a/homeassistant/components/logi_circle/camera.py
+++ b/homeassistant/components/logi_circle/camera.py
@@ -7,7 +7,7 @@ import voluptuous as vol
 
 from homeassistant.helpers import config_validation as cv
 from homeassistant.components.logi_circle import (
-    DOMAIN as LOGI_CIRCLE_DOMAIN, CONF_ATTRIBUTION)
+    DOMAIN as LOGI_CIRCLE_DOMAIN, ATTRIBUTION)
 from homeassistant.components.camera import (
     Camera, PLATFORM_SCHEMA, CAMERA_SERVICE_SCHEMA, SUPPORT_ON_OFF,
     ATTR_ENTITY_ID, ATTR_FILENAME, DOMAIN)
@@ -128,7 +128,7 @@ class LogiCam(Camera):
     def device_state_attributes(self):
         """Return the state attributes."""
         state = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'battery_saving_mode': (
                 STATE_ON if self._camera.battery_saving else STATE_OFF),
             'ip_address': self._camera.ip_address,
diff --git a/homeassistant/components/logi_circle/sensor.py b/homeassistant/components/logi_circle/sensor.py
index 74c2039c120..4830219091c 100644
--- a/homeassistant/components/logi_circle/sensor.py
+++ b/homeassistant/components/logi_circle/sensor.py
@@ -5,7 +5,7 @@ import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.components.logi_circle import (
-    CONF_ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DOMAIN as LOGI_CIRCLE_DOMAIN)
+    ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DOMAIN as LOGI_CIRCLE_DOMAIN)
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
     ATTR_ATTRIBUTION, ATTR_BATTERY_CHARGING,
@@ -86,7 +86,7 @@ class LogiSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         state = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'battery_saving_mode': (
                 STATE_ON if self._camera.battery_saving else STATE_OFF),
             'ip_address': self._camera.ip_address,
diff --git a/homeassistant/components/raincloud/__init__.py b/homeassistant/components/raincloud/__init__.py
index 47f6176d5f8..7ccf9f33ada 100644
--- a/homeassistant/components/raincloud/__init__.py
+++ b/homeassistant/components/raincloud/__init__.py
@@ -24,7 +24,8 @@ _LOGGER = logging.getLogger(__name__)
 
 ALLOWED_WATERING_TIME = [5, 10, 15, 30, 45, 60]
 
-CONF_ATTRIBUTION = "Data provided by Melnor Aquatimer.com"
+ATTRIBUTION = "Data provided by Melnor Aquatimer.com"
+
 CONF_WATERING_TIME = 'watering_minutes'
 
 NOTIFICATION_ID = 'raincloud_notification'
@@ -165,7 +166,7 @@ class RainCloudEntity(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'identifier': self.data.serial,
         }
 
diff --git a/homeassistant/components/raincloud/switch.py b/homeassistant/components/raincloud/switch.py
index 969169edc64..1b76e8974b0 100644
--- a/homeassistant/components/raincloud/switch.py
+++ b/homeassistant/components/raincloud/switch.py
@@ -1,16 +1,11 @@
-"""
-Support for Melnor RainCloud sprinkler water timer.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/switch.raincloud/
-"""
+"""Support for Melnor RainCloud sprinkler water timer."""
 import logging
 
 import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.components.raincloud import (
-    ALLOWED_WATERING_TIME, CONF_ATTRIBUTION, CONF_WATERING_TIME,
+    ALLOWED_WATERING_TIME, ATTRIBUTION, CONF_WATERING_TIME,
     DATA_RAINCLOUD, DEFAULT_WATERING_TIME, RainCloudEntity, SWITCHES)
 from homeassistant.components.switch import SwitchDevice, PLATFORM_SCHEMA
 from homeassistant.const import (
@@ -38,12 +33,9 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
         # create a sensor for each zone managed by faucet
         for zone in raincloud.controller.faucet.zones:
             sensors.append(
-                RainCloudSwitch(default_watering_timer,
-                                zone,
-                                sensor_type))
+                RainCloudSwitch(default_watering_timer, zone, sensor_type))
 
     add_entities(sensors, True)
-    return True
 
 
 class RainCloudSwitch(RainCloudEntity, SwitchDevice):
@@ -87,7 +79,7 @@ class RainCloudSwitch(RainCloudEntity, SwitchDevice):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'default_manual_timer': self._default_watering_timer,
             'identifier': self.data.serial
         }
diff --git a/homeassistant/components/ring/__init__.py b/homeassistant/components/ring/__init__.py
index 526388a0918..94f3be305fa 100644
--- a/homeassistant/components/ring/__init__.py
+++ b/homeassistant/components/ring/__init__.py
@@ -1,17 +1,17 @@
 """Support for Ring Doorbell/Chimes."""
 import logging
-from requests.exceptions import HTTPError, ConnectTimeout
 
+from requests.exceptions import ConnectTimeout, HTTPError
 import voluptuous as vol
 
+from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 import homeassistant.helpers.config_validation as cv
-from homeassistant.const import CONF_USERNAME, CONF_PASSWORD
 
 REQUIREMENTS = ['ring_doorbell==0.2.2']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by Ring.com"
+ATTRIBUTION = "Data provided by Ring.com"
 
 NOTIFICATION_ID = 'ring_notification'
 NOTIFICATION_TITLE = 'Ring Setup'
diff --git a/homeassistant/components/sensor/alpha_vantage.py b/homeassistant/components/sensor/alpha_vantage.py
index 79943a8b084..774a3fe95f6 100644
--- a/homeassistant/components/sensor/alpha_vantage.py
+++ b/homeassistant/components/sensor/alpha_vantage.py
@@ -23,7 +23,8 @@ ATTR_CLOSE = 'close'
 ATTR_HIGH = 'high'
 ATTR_LOW = 'low'
 
-CONF_ATTRIBUTION = "Stock market information provided by Alpha Vantage"
+ATTRIBUTION = "Stock market information provided by Alpha Vantage"
+
 CONF_FOREIGN_EXCHANGE = 'foreign_exchange'
 CONF_FROM = 'from'
 CONF_SYMBOL = 'symbol'
@@ -143,7 +144,7 @@ class AlphaVantageSensor(Entity):
         """Return the state attributes."""
         if self.values is not None:
             return {
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 ATTR_CLOSE: self.values['4. close'],
                 ATTR_HIGH: self.values['2. high'],
                 ATTR_LOW: self.values['3. low'],
@@ -203,7 +204,7 @@ class AlphaVantageForeignExchange(Entity):
         """Return the state attributes."""
         if self.values is not None:
             return {
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 CONF_FROM: self._from_currency,
                 CONF_TO: self._to_currency,
             }
diff --git a/homeassistant/components/sensor/bitcoin.py b/homeassistant/components/sensor/bitcoin.py
index 34855d19104..e654f29f42a 100644
--- a/homeassistant/components/sensor/bitcoin.py
+++ b/homeassistant/components/sensor/bitcoin.py
@@ -19,7 +19,7 @@ REQUIREMENTS = ['blockchain==1.4.4']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by blockchain.info"
+ATTRIBUTION = "Data provided by blockchain.info"
 
 DEFAULT_CURRENCY = 'USD'
 
@@ -112,7 +112,7 @@ class BitcoinSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/blockchain.py b/homeassistant/components/sensor/blockchain.py
index e51db7edcad..241c98d2328 100644
--- a/homeassistant/components/sensor/blockchain.py
+++ b/homeassistant/components/sensor/blockchain.py
@@ -18,8 +18,9 @@ REQUIREMENTS = ['python-blockchain-api==0.0.2']
 
 _LOGGER = logging.getLogger(__name__)
 
+ATTRIBUTION = "Data provided by blockchain.info"
+
 CONF_ADDRESSES = 'addresses'
-CONF_ATTRIBUTION = "Data provided by blockchain.info"
 
 DEFAULT_NAME = 'Bitcoin Balance'
 
@@ -82,7 +83,7 @@ class BlockchainSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/bom.py b/homeassistant/components/sensor/bom.py
index df8b5391359..62a3706034a 100644
--- a/homeassistant/components/sensor/bom.py
+++ b/homeassistant/components/sensor/bom.py
@@ -34,7 +34,8 @@ ATTR_STATION_ID = 'station_id'
 ATTR_STATION_NAME = 'station_name'
 ATTR_ZONE_ID = 'zone_id'
 
-CONF_ATTRIBUTION = "Data provided by the Australian Bureau of Meteorology"
+ATTRIBUTION = "Data provided by the Australian Bureau of Meteorology"
+
 CONF_STATION = 'station'
 CONF_ZONE_ID = 'zone_id'
 CONF_WMO_ID = 'wmo_id'
@@ -158,7 +159,7 @@ class BOMCurrentSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the device."""
         attr = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_LAST_UPDATE: self.bom_data.last_updated,
             ATTR_SENSOR_ID: self._condition,
             ATTR_STATION_ID: self.bom_data.latest_data['wmo'],
diff --git a/homeassistant/components/sensor/coinbase.py b/homeassistant/components/sensor/coinbase.py
index d25b7b786f8..54af94944d6 100644
--- a/homeassistant/components/sensor/coinbase.py
+++ b/homeassistant/components/sensor/coinbase.py
@@ -16,9 +16,10 @@ CURRENCY_ICONS = {
     'LTC': 'mdi:litecoin',
     'USD': 'mdi:currency-usd'
 }
+
 DEFAULT_COIN_ICON = 'mdi:coin'
 
-CONF_ATTRIBUTION = "Data provided by coinbase.com"
+ATTRIBUTION = "Data provided by coinbase.com"
 
 DATA_COINBASE = 'coinbase_cache'
 DEPENDENCIES = ['coinbase']
@@ -77,7 +78,7 @@ class AccountSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_NATIVE_BALANCE: "{} {}".format(
                 self._native_balance, self._native_currency),
         }
@@ -127,7 +128,7 @@ class ExchangeRateSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION
+            ATTR_ATTRIBUTION: ATTRIBUTION
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/coinmarketcap.py b/homeassistant/components/sensor/coinmarketcap.py
index 18d3f0a3d00..9143405a553 100644
--- a/homeassistant/components/sensor/coinmarketcap.py
+++ b/homeassistant/components/sensor/coinmarketcap.py
@@ -32,7 +32,8 @@ ATTR_RANK = 'rank'
 ATTR_SYMBOL = 'symbol'
 ATTR_TOTAL_SUPPLY = 'total_supply'
 
-CONF_ATTRIBUTION = "Data provided by CoinMarketCap"
+ATTRIBUTION = "Data provided by CoinMarketCap"
+
 CONF_CURRENCY_ID = 'currency_id'
 CONF_DISPLAY_CURRENCY_DECIMALS = 'display_currency_decimals'
 
@@ -115,7 +116,7 @@ class CoinMarketCapSensor(Entity):
             ATTR_VOLUME_24H:
                 self._ticker.get('quotes').get(self.data.display_currency)
                 .get('volume_24h'),
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_CIRCULATING_SUPPLY: self._ticker.get('circulating_supply'),
             ATTR_MARKET_CAP:
                 self._ticker.get('quotes').get(self.data.display_currency)
diff --git a/homeassistant/components/sensor/comed_hourly_pricing.py b/homeassistant/components/sensor/comed_hourly_pricing.py
index 12b8e917f9d..1771fd0f1a3 100644
--- a/homeassistant/components/sensor/comed_hourly_pricing.py
+++ b/homeassistant/components/sensor/comed_hourly_pricing.py
@@ -25,7 +25,8 @@ _RESOURCE = 'https://hourlypricing.comed.com/api'
 
 SCAN_INTERVAL = timedelta(minutes=5)
 
-CONF_ATTRIBUTION = "Data provided by ComEd Hourly Pricing service"
+ATTRIBUTION = "Data provided by ComEd Hourly Pricing service"
+
 CONF_CURRENT_HOUR_AVERAGE = 'current_hour_average'
 CONF_FIVE_MINUTE = 'five_minute'
 CONF_MONITORED_FEEDS = 'monitored_feeds'
@@ -97,8 +98,7 @@ class ComedHourlyPricingSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return the state attributes."""
-        attrs = {ATTR_ATTRIBUTION: CONF_ATTRIBUTION}
-        return attrs
+        return {ATTR_ATTRIBUTION: ATTRIBUTION}
 
     async def async_update(self):
         """Get the ComEd Hourly Pricing data from the web service."""
diff --git a/homeassistant/components/sensor/currencylayer.py b/homeassistant/components/sensor/currencylayer.py
index 67c9c7bbf19..bbc63633c51 100644
--- a/homeassistant/components/sensor/currencylayer.py
+++ b/homeassistant/components/sensor/currencylayer.py
@@ -19,7 +19,7 @@ from homeassistant.helpers.entity import Entity
 _LOGGER = logging.getLogger(__name__)
 _RESOURCE = 'http://apilayer.net/api/live'
 
-CONF_ATTRIBUTION = "Data provided by currencylayer.com"
+ATTRIBUTION = "Data provided by currencylayer.com"
 
 DEFAULT_BASE = 'USD'
 DEFAULT_NAME = 'CurrencyLayer Sensor'
@@ -91,7 +91,7 @@ class CurrencylayerSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/discogs.py b/homeassistant/components/sensor/discogs.py
index 70d7155fec7..c62cd3e759c 100644
--- a/homeassistant/components/sensor/discogs.py
+++ b/homeassistant/components/sensor/discogs.py
@@ -21,7 +21,7 @@ _LOGGER = logging.getLogger(__name__)
 
 ATTR_IDENTITY = 'identity'
 
-CONF_ATTRIBUTION = "Data provided by Discogs"
+ATTRIBUTION = "Data provided by Discogs"
 
 DEFAULT_NAME = 'Discogs'
 
@@ -86,7 +86,7 @@ class DiscogsSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_IDENTITY: self._identity.name,
         }
 
diff --git a/homeassistant/components/sensor/dublin_bus_transport.py b/homeassistant/components/sensor/dublin_bus_transport.py
index 02527f1e333..7a70d7af3a7 100644
--- a/homeassistant/components/sensor/dublin_bus_transport.py
+++ b/homeassistant/components/sensor/dublin_bus_transport.py
@@ -28,7 +28,8 @@ ATTR_DUE_IN = 'Due in'
 ATTR_DUE_AT = 'Due at'
 ATTR_NEXT_UP = 'Later Bus'
 
-CONF_ATTRIBUTION = "Data provided by data.dublinked.ie"
+ATTRIBUTION = "Data provided by data.dublinked.ie"
+
 CONF_STOP_ID = 'stopid'
 CONF_ROUTE = 'route'
 
@@ -101,7 +102,7 @@ class DublinPublicTransportSensor(Entity):
                 ATTR_DUE_AT: self._times[0][ATTR_DUE_AT],
                 ATTR_STOP_ID: self._stop,
                 ATTR_ROUTE: self._times[0][ATTR_ROUTE],
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 ATTR_NEXT_UP: next_up
             }
 
diff --git a/homeassistant/components/sensor/entur_public_transport.py b/homeassistant/components/sensor/entur_public_transport.py
index 64884764523..330f5f8cc56 100644
--- a/homeassistant/components/sensor/entur_public_transport.py
+++ b/homeassistant/components/sensor/entur_public_transport.py
@@ -26,7 +26,8 @@ ATTR_NEXT_UP_IN = 'next_due_in'
 
 API_CLIENT_NAME = 'homeassistant-homeassistant'
 
-CONF_ATTRIBUTION = "Data provided by entur.org under NLOD."
+ATTRIBUTION = "Data provided by entur.org under NLOD"
+
 CONF_STOP_IDS = 'stop_ids'
 CONF_EXPAND_PLATFORMS = 'expand_platforms'
 CONF_WHITELIST_LINES = 'line_whitelist'
@@ -140,7 +141,7 @@ class EnturPublicTransportSensor(Entity):
         self._state = None
         self._icon = ICONS[DEFAULT_ICON_KEY]
         self._attributes = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_STOP_ID: self._stop,
         }
 
diff --git a/homeassistant/components/sensor/etherscan.py b/homeassistant/components/sensor/etherscan.py
index 24cf046cca0..3b76d888e26 100644
--- a/homeassistant/components/sensor/etherscan.py
+++ b/homeassistant/components/sensor/etherscan.py
@@ -15,10 +15,11 @@ from homeassistant.helpers.entity import Entity
 
 REQUIREMENTS = ['python-etherscan-api==0.0.3']
 
+ATTRIBUTION = "Data provided by etherscan.io"
+
 CONF_ADDRESS = 'address'
 CONF_TOKEN = 'token'
 CONF_TOKEN_ADDRESS = 'token_address'
-CONF_ATTRIBUTION = "Data provided by etherscan.io"
 
 SCAN_INTERVAL = timedelta(minutes=5)
 
@@ -77,9 +78,7 @@ class EtherscanSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
-        return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
-        }
+        return {ATTR_ATTRIBUTION: ATTRIBUTION}
 
     def update(self):
         """Get the latest state of the sensor."""
diff --git a/homeassistant/components/sensor/fitbit.py b/homeassistant/components/sensor/fitbit.py
index f5b44d577a7..d5d9150e4e8 100644
--- a/homeassistant/components/sensor/fitbit.py
+++ b/homeassistant/components/sensor/fitbit.py
@@ -35,7 +35,7 @@ ATTR_LAST_SAVED_AT = 'last_saved_at'
 
 CONF_MONITORED_RESOURCES = 'monitored_resources'
 CONF_CLOCK_FORMAT = 'clock_format'
-CONF_ATTRIBUTION = 'Data provided by Fitbit.com'
+ATTRIBUTION = 'Data provided by Fitbit.com'
 
 DEPENDENCIES = ['http']
 
@@ -423,8 +423,8 @@ class FitbitSensor(Entity):
         """Icon to use in the frontend, if any."""
         if self.resource_type == 'devices/battery' and self.extra:
             battery_level = BATTERY_LEVELS[self.extra.get('battery')]
-            return icon_for_battery_level(battery_level=battery_level,
-                                          charging=None)
+            return icon_for_battery_level(
+                battery_level=battery_level, charging=None)
         return 'mdi:{}'.format(FITBIT_RESOURCES_LIST[self.resource_type][2])
 
     @property
@@ -432,7 +432,7 @@ class FitbitSensor(Entity):
         """Return the state attributes."""
         attrs = {}
 
-        attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
 
         if self.extra:
             attrs['model'] = self.extra.get('deviceVersion')
diff --git a/homeassistant/components/sensor/fixer.py b/homeassistant/components/sensor/fixer.py
index 1bdd9e71272..c46fa751319 100644
--- a/homeassistant/components/sensor/fixer.py
+++ b/homeassistant/components/sensor/fixer.py
@@ -20,8 +20,8 @@ _LOGGER = logging.getLogger(__name__)
 
 ATTR_EXCHANGE_RATE = 'Exchange rate'
 ATTR_TARGET = 'Target currency'
+ATTRIBUTION = "Data provided by the European Central Bank (ECB)"
 
-CONF_ATTRIBUTION = "Data provided by the European Central Bank (ECB)"
 CONF_TARGET = 'target'
 
 DEFAULT_BASE = 'USD'
@@ -86,7 +86,7 @@ class ExchangeRateSensor(Entity):
         """Return the state attributes."""
         if self.data.rate is not None:
             return {
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 ATTR_EXCHANGE_RATE: self.data.rate['rates'][self._target],
                 ATTR_TARGET: self._target,
             }
diff --git a/homeassistant/components/sensor/gitlab_ci.py b/homeassistant/components/sensor/gitlab_ci.py
index 1e55a7d6997..7f3b444bb75 100644
--- a/homeassistant/components/sensor/gitlab_ci.py
+++ b/homeassistant/components/sensor/gitlab_ci.py
@@ -28,8 +28,8 @@ ATTR_BUILD_FINISHED = 'build_finished'
 ATTR_BUILD_ID = 'build id'
 ATTR_BUILD_STARTED = 'build_started'
 ATTR_BUILD_STATUS = 'build_status'
+ATTRIBUTION = "Information provided by https://gitlab.com/"
 
-CONF_ATTRIBUTION = "Information provided by https://gitlab.com/"
 CONF_GITLAB_ID = 'gitlab_id'
 
 DEFAULT_NAME = 'GitLab CI Status'
@@ -101,7 +101,7 @@ class GitLabSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_BUILD_STATUS: self._state,
             ATTR_BUILD_STARTED: self._started_at,
             ATTR_BUILD_FINISHED: self._finished_at,
diff --git a/homeassistant/components/sensor/haveibeenpwned.py b/homeassistant/components/sensor/haveibeenpwned.py
index 4d651ea81c7..a4ae2349e24 100644
--- a/homeassistant/components/sensor/haveibeenpwned.py
+++ b/homeassistant/components/sensor/haveibeenpwned.py
@@ -12,7 +12,7 @@ import requests
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_EMAIL
+from homeassistant.const import CONF_EMAIL, ATTR_ATTRIBUTION
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.event import track_point_in_time
@@ -21,6 +21,8 @@ import homeassistant.util.dt as dt_util
 
 _LOGGER = logging.getLogger(__name__)
 
+ATTRIBUTION = "Data provided by Have I Been Pwned (HIBP)"
+
 DATE_STR_FORMAT = "%Y-%m-%d %H:%M:%S"
 
 HA_USER_AGENT = "Home Assistant HaveIBeenPwned Sensor Component"
@@ -75,7 +77,7 @@ class HaveIBeenPwnedSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return the attributes of the sensor."""
-        val = {}
+        val = {ATTR_ATTRIBUTION: ATTRIBUTION}
         if self._email not in self._data.data:
             return val
 
diff --git a/homeassistant/components/sensor/iperf3.py b/homeassistant/components/sensor/iperf3.py
index 0eb6dfaa00c..32127c79a91 100644
--- a/homeassistant/components/sensor/iperf3.py
+++ b/homeassistant/components/sensor/iperf3.py
@@ -25,7 +25,8 @@ ATTR_REMOTE_HOST = 'Remote Server'
 ATTR_REMOTE_PORT = 'Remote Port'
 ATTR_VERSION = 'Version'
 
-CONF_ATTRIBUTION = 'Data retrieved using Iperf3'
+ATTRIBUTION = 'Data retrieved using Iperf3'
+
 CONF_DURATION = 'duration'
 CONF_PARALLEL = 'parallel'
 
@@ -106,11 +107,10 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 class Iperf3Sensor(Entity):
     """A Iperf3 sensor implementation."""
 
-    def __init__(self, server, port, duration, streams,
-                 protocol, sensor_type):
+    def __init__(self, server, port, duration, streams, protocol, sensor_type):
         """Initialize the sensor."""
         self._attrs = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_PROTOCOL: protocol,
         }
         self._name = \
@@ -144,7 +144,7 @@ class Iperf3Sensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         if self.result is not None:
-            self._attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+            self._attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
             self._attrs[ATTR_REMOTE_HOST] = self.result.remote_host
             self._attrs[ATTR_REMOTE_PORT] = self.result.remote_port
             self._attrs[ATTR_VERSION] = self.result.version
diff --git a/homeassistant/components/sensor/irish_rail_transport.py b/homeassistant/components/sensor/irish_rail_transport.py
index 10f4004ae74..e17ecfde59d 100644
--- a/homeassistant/components/sensor/irish_rail_transport.py
+++ b/homeassistant/components/sensor/irish_rail_transport.py
@@ -1,9 +1,4 @@
-"""
-Support for Irish Rail RTPI information.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/sensor.irish_rail_transport/
-"""
+"""Support for Irish Rail RTPI information."""
 import logging
 from datetime import timedelta
 
@@ -11,7 +6,7 @@ import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_NAME, ATTR_ATTRIBUTION
 from homeassistant.helpers.entity import Entity
 
 REQUIREMENTS = ['pyirishrail==0.0.2']
@@ -28,6 +23,7 @@ ATTR_DUE_AT = "Due at"
 ATTR_EXPECT_AT = "Expected at"
 ATTR_NEXT_UP = "Later Train"
 ATTR_TRAIN_TYPE = "Train type"
+ATTRIBUTION = "Data provided by Irish Rail"
 
 CONF_STATION = 'station'
 CONF_DESTINATION = 'destination'
@@ -100,6 +96,7 @@ class IrishRailTransportSensor(Entity):
                 next_up += self._times[1][ATTR_DUE_IN]
 
             return {
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 ATTR_STATION: self._station,
                 ATTR_ORIGIN: self._times[0][ATTR_ORIGIN],
                 ATTR_DESTINATION: self._times[0][ATTR_DESTINATION],
@@ -109,7 +106,7 @@ class IrishRailTransportSensor(Entity):
                 ATTR_DIRECTION: self._times[0][ATTR_DIRECTION],
                 ATTR_STOPS_AT: self._times[0][ATTR_STOPS_AT],
                 ATTR_NEXT_UP: next_up,
-                ATTR_TRAIN_TYPE: self._times[0][ATTR_TRAIN_TYPE]
+                ATTR_TRAIN_TYPE: self._times[0][ATTR_TRAIN_TYPE],
             }
 
     @property
@@ -146,22 +143,23 @@ class IrishRailTransportData:
 
     def update(self):
         """Get the latest data from irishrail."""
-        trains = self._ir_api.get_station_by_name(self.station,
-                                                  direction=self.direction,
-                                                  destination=self.destination,
-                                                  stops_at=self.stops_at)
+        trains = self._ir_api.get_station_by_name(
+            self.station, direction=self.direction,
+            destination=self.destination, stops_at=self.stops_at)
         stops_at = self.stops_at if self.stops_at else ''
         self.info = []
         for train in trains:
-            train_data = {ATTR_STATION: self.station,
-                          ATTR_ORIGIN: train.get('origin'),
-                          ATTR_DESTINATION: train.get('destination'),
-                          ATTR_DUE_IN: train.get('due_in_mins'),
-                          ATTR_DUE_AT: train.get('scheduled_arrival_time'),
-                          ATTR_EXPECT_AT: train.get('expected_departure_time'),
-                          ATTR_DIRECTION: train.get('direction'),
-                          ATTR_STOPS_AT: stops_at,
-                          ATTR_TRAIN_TYPE: train.get('type')}
+            train_data = {
+                ATTR_STATION: self.station,
+                ATTR_ORIGIN: train.get('origin'),
+                ATTR_DESTINATION: train.get('destination'),
+                ATTR_DUE_IN: train.get('due_in_mins'),
+                ATTR_DUE_AT: train.get('scheduled_arrival_time'),
+                ATTR_EXPECT_AT: train.get('expected_departure_time'),
+                ATTR_DIRECTION: train.get('direction'),
+                ATTR_STOPS_AT: stops_at,
+                ATTR_TRAIN_TYPE: train.get('type'),
+            }
             self.info.append(train_data)
 
         if not self.info:
@@ -180,4 +178,5 @@ class IrishRailTransportData:
                  ATTR_EXPECT_AT: 'n/a',
                  ATTR_DIRECTION: direction,
                  ATTR_STOPS_AT: stops_at,
-                 ATTR_TRAIN_TYPE: ''}]
+                 ATTR_TRAIN_TYPE: '',
+                 }]
diff --git a/homeassistant/components/sensor/lastfm.py b/homeassistant/components/sensor/lastfm.py
index fa69a916495..bb5a09771c2 100644
--- a/homeassistant/components/sensor/lastfm.py
+++ b/homeassistant/components/sensor/lastfm.py
@@ -1,16 +1,11 @@
-"""
-Sensor for Last.fm account status.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/sensor.lastfm/
-"""
+"""Sensor for Last.fm account status."""
 import logging
 import re
 
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_API_KEY
+from homeassistant.const import CONF_API_KEY, ATTR_ATTRIBUTION
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
@@ -21,6 +16,7 @@ _LOGGER = logging.getLogger(__name__)
 ATTR_LAST_PLAYED = 'last_played'
 ATTR_PLAY_COUNT = 'play_count'
 ATTR_TOP_PLAYED = 'top_played'
+ATTRIBUTION = "Data provided by Last.fm"
 
 CONF_USERS = 'users'
 
@@ -105,6 +101,7 @@ class LastfmSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             ATTR_LAST_PLAYED: self._lastplayed,
             ATTR_PLAY_COUNT: self._playcount,
             ATTR_TOP_PLAYED: self._topplayed,
diff --git a/homeassistant/components/sensor/london_underground.py b/homeassistant/components/sensor/london_underground.py
index d44806cf481..1c93d6a1bcb 100644
--- a/homeassistant/components/sensor/london_underground.py
+++ b/homeassistant/components/sensor/london_underground.py
@@ -18,8 +18,11 @@ REQUIREMENTS = ['london-tube-status==0.2']
 _LOGGER = logging.getLogger(__name__)
 
 ATTRIBUTION = "Powered by TfL Open Data"
+
 CONF_LINE = 'line'
+
 SCAN_INTERVAL = timedelta(seconds=30)
+
 TUBE_LINES = [
     'Bakerloo',
     'Central',
@@ -34,7 +37,8 @@ TUBE_LINES = [
     'Piccadilly',
     'TfL Rail',
     'Victoria',
-    'Waterloo & City']
+    'Waterloo & City',
+]
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_LINE):
diff --git a/homeassistant/components/sensor/metoffice.py b/homeassistant/components/sensor/metoffice.py
index 8cebecb7124..3d9c9485da3 100644
--- a/homeassistant/components/sensor/metoffice.py
+++ b/homeassistant/components/sensor/metoffice.py
@@ -26,7 +26,7 @@ ATTR_SENSOR_ID = 'sensor_id'
 ATTR_SITE_ID = 'site_id'
 ATTR_SITE_NAME = 'site_name'
 
-CONF_ATTRIBUTION = "Data provided by the Met Office"
+ATTRIBUTION = "Data provided by the Met Office"
 
 CONDITION_CLASSES = {
     'cloudy': ['7', '8'],
@@ -162,7 +162,7 @@ class MetOfficeCurrentSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the device."""
         attr = {}
-        attr[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attr[ATTR_ATTRIBUTION] = ATTRIBUTION
         attr[ATTR_LAST_UPDATE] = self.data.data.date
         attr[ATTR_SENSOR_ID] = self._condition
         attr[ATTR_SITE_ID] = self.site.id
diff --git a/homeassistant/components/sensor/nederlandse_spoorwegen.py b/homeassistant/components/sensor/nederlandse_spoorwegen.py
index 81cfada25f6..5d9376ad9eb 100644
--- a/homeassistant/components/sensor/nederlandse_spoorwegen.py
+++ b/homeassistant/components/sensor/nederlandse_spoorwegen.py
@@ -21,7 +21,8 @@ REQUIREMENTS = ['nsapi==2.7.4']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by NS"
+ATTRIBUTION = "Data provided by NS"
+
 CONF_ROUTES = 'routes'
 CONF_FROM = 'from'
 CONF_TO = 'to'
@@ -155,7 +156,7 @@ class NSDepartureSensor(Entity):
             'transfers': self._trips[0].nr_transfers,
             'route': route,
             'remarks': [r.message for r in self._trips[0].trip_remarks],
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
diff --git a/homeassistant/components/sensor/nsw_fuel_station.py b/homeassistant/components/sensor/nsw_fuel_station.py
index 60ad83a82f2..f0da619a6e7 100644
--- a/homeassistant/components/sensor/nsw_fuel_station.py
+++ b/homeassistant/components/sensor/nsw_fuel_station.py
@@ -28,7 +28,8 @@ CONF_FUEL_TYPES = 'fuel_types'
 CONF_ALLOWED_FUEL_TYPES = ["E10", "U91", "E85", "P95", "P98", "DL",
                            "PDL", "B20", "LPG", "CNG", "EV"]
 CONF_DEFAULT_FUEL_TYPES = ["E10", "U91"]
-CONF_ATTRIBUTION = "Data provided by NSW Government FuelCheck"
+
+ATTRIBUTION = "Data provided by NSW Government FuelCheck"
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_STATION_ID): cv.positive_int,
@@ -161,7 +162,7 @@ class StationPriceSensor(Entity):
         return {
             ATTR_STATION_ID: self._station_data.station_id,
             ATTR_STATION_NAME: self._station_data.get_station_name(),
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION
+            ATTR_ATTRIBUTION: ATTRIBUTION
         }
 
     @property
diff --git a/homeassistant/components/sensor/openexchangerates.py b/homeassistant/components/sensor/openexchangerates.py
index 01c84c63034..6361b823dea 100644
--- a/homeassistant/components/sensor/openexchangerates.py
+++ b/homeassistant/components/sensor/openexchangerates.py
@@ -20,7 +20,7 @@ from homeassistant.util import Throttle
 _LOGGER = logging.getLogger(__name__)
 _RESOURCE = 'https://openexchangerates.org/api/latest.json'
 
-CONF_ATTRIBUTION = "Data provided by openexchangerates.org"
+ATTRIBUTION = "Data provided by openexchangerates.org"
 
 DEFAULT_BASE = 'USD'
 DEFAULT_NAME = 'Exchange Rate Sensor'
@@ -82,7 +82,7 @@ class OpenexchangeratesSensor(Entity):
     def device_state_attributes(self):
         """Return other attributes of the sensor."""
         attr = self.rest.data
-        attr[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attr[ATTR_ATTRIBUTION] = ATTRIBUTION
 
         return attr
 
diff --git a/homeassistant/components/sensor/openweathermap.py b/homeassistant/components/sensor/openweathermap.py
index b6a4ff0860e..a137836138b 100644
--- a/homeassistant/components/sensor/openweathermap.py
+++ b/homeassistant/components/sensor/openweathermap.py
@@ -21,7 +21,8 @@ REQUIREMENTS = ['pyowm==2.10.0']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by OpenWeatherMap"
+ATTRIBUTION = "Data provided by OpenWeatherMap"
+
 CONF_FORECAST = 'forecast'
 CONF_LANGUAGE = 'language'
 
@@ -121,7 +122,7 @@ class OpenWeatherMapSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/rejseplanen.py b/homeassistant/components/sensor/rejseplanen.py
index bade1bd6315..7a8cddb6179 100755
--- a/homeassistant/components/sensor/rejseplanen.py
+++ b/homeassistant/components/sensor/rejseplanen.py
@@ -31,7 +31,8 @@ ATTR_DUE_IN = 'Due in'
 ATTR_DUE_AT = 'Due at'
 ATTR_NEXT_UP = 'Later departure'
 
-CONF_ATTRIBUTION = "Data provided by rejseplanen.dk"
+ATTRIBUTION = "Data provided by rejseplanen.dk"
+
 CONF_STOP_ID = 'stop_id'
 CONF_ROUTE = 'route'
 CONF_DIRECTION = 'direction'
@@ -50,8 +51,8 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Optional(CONF_DIRECTION, default=[]):
         vol.All(cv.ensure_list, [cv.string]),
     vol.Optional(CONF_DEPARTURE_TYPE, default=[]):
-        vol.All(cv.ensure_list, [vol.In(list(['BUS', 'EXB', 'M',
-                                              'S', 'REG']))])
+        vol.All(cv.ensure_list,
+                [vol.In(list(['BUS', 'EXB', 'M', 'S', 'REG']))])
 })
 
 
@@ -75,12 +76,8 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
     departure_type = config[CONF_DEPARTURE_TYPE]
 
     data = PublicTransportData(stop_id, route, direction, departure_type)
-    add_devices([RejseplanenTransportSensor(data,
-                                            stop_id,
-                                            route,
-                                            direction,
-                                            name)],
-                True)
+    add_devices([RejseplanenTransportSensor(
+        data, stop_id, route, direction, name)], True)
 
 
 class RejseplanenTransportSensor(Entity):
@@ -111,13 +108,11 @@ class RejseplanenTransportSensor(Entity):
         if self._times is not None:
             next_up = None
             if len(self._times) > 1:
-                next_up = ('{} towards '
-                           '{} in '
-                           '{} from '
-                           '{}'.format(self._times[1][ATTR_ROUTE],
-                                       self._times[1][ATTR_DIRECTION],
-                                       str(self._times[1][ATTR_DUE_IN]),
-                                       self._times[1][ATTR_STOP_NAME]))
+                next_up = ('{} towards {} in {} from {}'.format(
+                    self._times[1][ATTR_ROUTE],
+                    self._times[1][ATTR_DIRECTION],
+                    str(self._times[1][ATTR_DUE_IN]),
+                    self._times[1][ATTR_STOP_NAME]))
             params = {
                 ATTR_DUE_IN: str(self._times[0][ATTR_DUE_IN]),
                 ATTR_DUE_AT: self._times[0][ATTR_DUE_AT],
@@ -126,9 +121,9 @@ class RejseplanenTransportSensor(Entity):
                 ATTR_DIRECTION: self._times[0][ATTR_DIRECTION],
                 ATTR_STOP_NAME: self._times[0][ATTR_STOP_NAME],
                 ATTR_STOP_ID: self._stop_id,
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                ATTR_ATTRIBUTION: ATTRIBUTION,
                 ATTR_NEXT_UP: next_up
-                }
+            }
             return {k: v for k, v in params.items() if v}
 
     @property
diff --git a/homeassistant/components/sensor/ring.py b/homeassistant/components/sensor/ring.py
index 9478768f889..d58e0cf8b3f 100644
--- a/homeassistant/components/sensor/ring.py
+++ b/homeassistant/components/sensor/ring.py
@@ -11,7 +11,7 @@ import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.components.ring import (
-    CONF_ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DATA_RING)
+    ATTRIBUTION, DEFAULT_ENTITY_NAMESPACE, DATA_RING)
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
     CONF_ENTITY_NAMESPACE, CONF_MONITORED_CONDITIONS,
@@ -122,7 +122,7 @@ class RingSensor(Entity):
         """Return the state attributes."""
         attrs = {}
 
-        attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
         attrs['device_id'] = self._data.id
         attrs['firmware'] = self._data.firmware
         attrs['kind'] = self._data.kind
diff --git a/homeassistant/components/sensor/ripple.py b/homeassistant/components/sensor/ripple.py
index beb7bf22269..4abbc4efe06 100644
--- a/homeassistant/components/sensor/ripple.py
+++ b/homeassistant/components/sensor/ripple.py
@@ -16,7 +16,7 @@ from homeassistant.helpers.entity import Entity
 REQUIREMENTS = ['python-ripple-api==0.0.3']
 
 CONF_ADDRESS = 'address'
-CONF_ATTRIBUTION = "Data provided by ripple.com"
+ATTRIBUTION = "Data provided by ripple.com"
 
 DEFAULT_NAME = 'Ripple Balance'
 
@@ -65,7 +65,7 @@ class RippleSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/sochain.py b/homeassistant/components/sensor/sochain.py
index b582ba04567..d5bd4e5da82 100644
--- a/homeassistant/components/sensor/sochain.py
+++ b/homeassistant/components/sensor/sochain.py
@@ -19,9 +19,10 @@ REQUIREMENTS = ['python-sochain-api==0.0.2']
 
 _LOGGER = logging.getLogger(__name__)
 
+ATTRIBUTION = "Data provided by chain.so"
+
 CONF_ADDRESS = 'address'
 CONF_NETWORK = 'network'
-CONF_ATTRIBUTION = "Data provided by chain.so"
 
 DEFAULT_NAME = 'Crypto Balance'
 
@@ -34,8 +35,8 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
 })
 
 
-async def async_setup_platform(hass, config, async_add_entities,
-                               discovery_info=None):
+async def async_setup_platform(
+        hass, config, async_add_entities, discovery_info=None):
     """Set up the sochain sensors."""
     from pysochain import ChainSo
     address = config.get(CONF_ADDRESS)
@@ -77,7 +78,7 @@ class SochainSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     async def async_update(self):
diff --git a/homeassistant/components/sensor/swiss_public_transport.py b/homeassistant/components/sensor/swiss_public_transport.py
index 6b34930075a..d9f2410f8ca 100644
--- a/homeassistant/components/sensor/swiss_public_transport.py
+++ b/homeassistant/components/sensor/swiss_public_transport.py
@@ -30,7 +30,8 @@ ATTR_TARGET = 'destination'
 ATTR_TRAIN_NUMBER = 'train_number'
 ATTR_TRANSFERS = 'transfers'
 
-CONF_ATTRIBUTION = "Data provided by transport.opendata.ch"
+ATTRIBUTION = "Data provided by transport.opendata.ch"
+
 CONF_DESTINATION = 'to'
 CONF_START = 'from'
 
@@ -113,7 +114,7 @@ class SwissPublicTransportSensor(Entity):
             ATTR_START: self._opendata.from_name,
             ATTR_TARGET: self._opendata.to_name,
             ATTR_REMAINING_TIME: '{}'.format(self._remaining_time),
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
         return attr
 
diff --git a/homeassistant/components/sensor/synologydsm.py b/homeassistant/components/sensor/synologydsm.py
index 39a9e75c47b..2b443738230 100644
--- a/homeassistant/components/sensor/synologydsm.py
+++ b/homeassistant/components/sensor/synologydsm.py
@@ -1,9 +1,4 @@
-"""
-Support for Synology NAS Sensors.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/sensor.synologydsm/
-"""
+"""Support for Synology NAS Sensors."""
 import logging
 from datetime import timedelta
 
@@ -22,7 +17,8 @@ REQUIREMENTS = ['python-synology==0.2.0']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = 'Data provided by Synology'
+ATTRIBUTION = 'Data provided by Synology'
+
 CONF_VOLUMES = 'volumes'
 DEFAULT_NAME = 'Synology DSM'
 DEFAULT_PORT = 5001
@@ -194,7 +190,7 @@ class SynoNasSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
 
diff --git a/homeassistant/components/sensor/sytadin.py b/homeassistant/components/sensor/sytadin.py
index 082342a0393..f8ef18fcffe 100644
--- a/homeassistant/components/sensor/sytadin.py
+++ b/homeassistant/components/sensor/sytadin.py
@@ -24,8 +24,7 @@ _LOGGER = logging.getLogger(__name__)
 
 URL = 'http://www.sytadin.fr/sys/barometres_de_la_circulation.jsp.html'
 
-CONF_ATTRIBUTION = "Data provided by Direction des routes Île-de-France" \
-                   "(DiRIF)"
+ATTRIBUTION = "Data provided by Direction des routes Île-de-France (DiRIF)"
 
 DEFAULT_NAME = 'Sytadin'
 REGEX = r'(\d*\.\d+|\d+)'
@@ -95,7 +94,7 @@ class SytadinSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     def update(self):
diff --git a/homeassistant/components/sensor/trafikverket_weatherstation.py b/homeassistant/components/sensor/trafikverket_weatherstation.py
index 433bb8e9ed1..38cc23dabbe 100644
--- a/homeassistant/components/sensor/trafikverket_weatherstation.py
+++ b/homeassistant/components/sensor/trafikverket_weatherstation.py
@@ -24,12 +24,13 @@ REQUIREMENTS = ['pytrafikverket==0.1.5.8']
 
 _LOGGER = logging.getLogger(__name__)
 
-SCAN_INTERVAL = timedelta(seconds=300)
-MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=10)
+ATTRIBUTION = "Data provided by Trafikverket API"
 
-CONF_ATTRIBUTION = "Data provided by Trafikverket API"
 CONF_STATION = 'station'
 
+MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=10)
+
+SCAN_INTERVAL = timedelta(seconds=300)
 
 SENSOR_TYPES = {
     'air_temp': ['Air temperature', '°C', 'air_temp'],
@@ -50,8 +51,8 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
 })
 
 
-async def async_setup_platform(hass, config, async_add_entities,
-                               discovery_info=None):
+async def async_setup_platform(
+        hass, config, async_add_entities, discovery_info=None):
     """Set up the Trafikverket sensor platform."""
     from pytrafikverket.trafikverket_weather import TrafikverketWeather
 
@@ -85,7 +86,7 @@ class TrafikverketWeatherStation(Entity):
         self._station = sensor_station
         self._weather_api = weather_api
         self._attributes = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
         self._weather = None
 
diff --git a/homeassistant/components/sensor/transport_nsw.py b/homeassistant/components/sensor/transport_nsw.py
index 2e28d81a2c3..3c40bf4f709 100644
--- a/homeassistant/components/sensor/transport_nsw.py
+++ b/homeassistant/components/sensor/transport_nsw.py
@@ -1,9 +1,4 @@
-"""
-Transport NSW (AU) sensor to query next leave event for a specified stop.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/sensor.transport_nsw/
-"""
+"""Support for Transport NSW (AU) to query next leave event."""
 from datetime import timedelta
 import logging
 
@@ -26,7 +21,8 @@ ATTR_REAL_TIME = 'real_time'
 ATTR_DESTINATION = 'destination'
 ATTR_MODE = 'mode'
 
-CONF_ATTRIBUTION = "Data provided by Transport NSW"
+ATTRIBUTION = "Data provided by Transport NSW"
+
 CONF_STOP_ID = 'stop_id'
 CONF_ROUTE = 'route'
 CONF_DESTINATION = 'destination'
@@ -40,7 +36,7 @@ ICONS = {
     'Ferry': 'mdi:ferry',
     'Schoolbus': 'mdi:bus',
     'n/a': 'mdi:clock',
-    None: 'mdi:clock'
+    None: 'mdi:clock',
 }
 
 SCAN_INTERVAL = timedelta(seconds=60)
@@ -99,7 +95,7 @@ class TransportNSWSensor(Entity):
                 ATTR_REAL_TIME: self._times[ATTR_REAL_TIME],
                 ATTR_DESTINATION: self._times[ATTR_DESTINATION],
                 ATTR_MODE: self._times[ATTR_MODE],
-                ATTR_ATTRIBUTION: CONF_ATTRIBUTION
+                ATTR_ATTRIBUTION: ATTRIBUTION
             }
 
     @property
diff --git a/homeassistant/components/sensor/travisci.py b/homeassistant/components/sensor/travisci.py
index e1bd74b993c..c96bb18e958 100644
--- a/homeassistant/components/sensor/travisci.py
+++ b/homeassistant/components/sensor/travisci.py
@@ -20,7 +20,8 @@ REQUIREMENTS = ['TravisPy==0.3.5']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Information provided by https://travis-ci.org/"
+ATTRIBUTION = "Information provided by https://travis-ci.org/"
+
 CONF_BRANCH = 'branch'
 CONF_REPOSITORY = 'repository'
 
@@ -130,7 +131,7 @@ class TravisCISensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         attrs = {}
-        attrs[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attrs[ATTR_ATTRIBUTION] = ATTRIBUTION
 
         if self._build and self._state is not None:
             if self._user and self._sensor_type == 'state':
diff --git a/homeassistant/components/sensor/vasttrafik.py b/homeassistant/components/sensor/vasttrafik.py
index 124b0ff44ea..8148a5c2fc7 100644
--- a/homeassistant/components/sensor/vasttrafik.py
+++ b/homeassistant/components/sensor/vasttrafik.py
@@ -24,8 +24,8 @@ ATTR_ACCESSIBILITY = 'accessibility'
 ATTR_DIRECTION = 'direction'
 ATTR_LINE = 'line'
 ATTR_TRACK = 'track'
+ATTRIBUTION = "Data provided by Västtrafik"
 
-CONF_ATTRIBUTION = "Data provided by Västtrafik"
 CONF_DELAY = 'delay'
 CONF_DEPARTURES = 'departures'
 CONF_FROM = 'from'
@@ -137,7 +137,7 @@ class VasttrafikDepartureSensor(Entity):
 
                     params = {
                         ATTR_ACCESSIBILITY: departure.get('accessibility'),
-                        ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+                        ATTR_ATTRIBUTION: ATTRIBUTION,
                         ATTR_DIRECTION: departure.get('direction'),
                         ATTR_LINE: departure.get('sname'),
                         ATTR_TRACK: departure.get('track'),
diff --git a/homeassistant/components/sensor/viaggiatreno.py b/homeassistant/components/sensor/viaggiatreno.py
index 82068c456b6..2b8de2042fa 100644
--- a/homeassistant/components/sensor/viaggiatreno.py
+++ b/homeassistant/components/sensor/viaggiatreno.py
@@ -18,7 +18,8 @@ from homeassistant.helpers.entity import Entity
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Powered by ViaggiaTreno Data"
+ATTRIBUTION = "Powered by ViaggiaTreno Data"
+
 VIAGGIATRENO_ENDPOINT = ("http://www.viaggiatreno.it/viaggiatrenonew/"
                          "resteasy/viaggiatreno/andamentoTreno/"
                          "{station_id}/{train_id}")
@@ -35,7 +36,7 @@ MONITORED_INFO = [
     'orarioPartenza',
     'origine',
     'subTitle',
-    ]
+]
 
 DEFAULT_NAME = "Train {}"
 
@@ -121,7 +122,7 @@ class ViaggiaTrenoSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return extra attributes."""
-        self._attributes[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        self._attributes[ATTR_ATTRIBUTION] = ATTRIBUTION
         return self._attributes
 
     @staticmethod
diff --git a/homeassistant/components/sensor/waze_travel_time.py b/homeassistant/components/sensor/waze_travel_time.py
index ae38c529fe2..6634339be4b 100644
--- a/homeassistant/components/sensor/waze_travel_time.py
+++ b/homeassistant/components/sensor/waze_travel_time.py
@@ -26,7 +26,8 @@ ATTR_DURATION = 'duration'
 ATTR_DISTANCE = 'distance'
 ATTR_ROUTE = 'route'
 
-CONF_ATTRIBUTION = "Powered by Waze"
+ATTRIBUTION = "Powered by Waze"
+
 CONF_DESTINATION = 'destination'
 CONF_ORIGIN = 'origin'
 CONF_INCL_FILTER = 'incl_filter'
@@ -138,7 +139,7 @@ class WazeTravelTime(Entity):
         if self._state is None:
             return None
 
-        res = {ATTR_ATTRIBUTION: CONF_ATTRIBUTION}
+        res = {ATTR_ATTRIBUTION: ATTRIBUTION}
         if 'duration' in self._state:
             res[ATTR_DURATION] = self._state['duration']
         if 'distance' in self._state:
diff --git a/homeassistant/components/sensor/worldtidesinfo.py b/homeassistant/components/sensor/worldtidesinfo.py
index fea3e92a140..0f7bfeaa900 100644
--- a/homeassistant/components/sensor/worldtidesinfo.py
+++ b/homeassistant/components/sensor/worldtidesinfo.py
@@ -19,7 +19,7 @@ from homeassistant.helpers.entity import Entity
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by WorldTides"
+ATTRIBUTION = "Data provided by WorldTides"
 
 DEFAULT_NAME = 'WorldTidesInfo'
 
@@ -72,7 +72,7 @@ class WorldTidesInfoSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return the state attributes of this device."""
-        attr = {ATTR_ATTRIBUTION: CONF_ATTRIBUTION}
+        attr = {ATTR_ATTRIBUTION: ATTRIBUTION}
 
         if 'High' in str(self.data['extremes'][0]['type']):
             attr['high_tide_time_utc'] = self.data['extremes'][0]['date']
diff --git a/homeassistant/components/sensor/wsdot.py b/homeassistant/components/sensor/wsdot.py
index 84f2e8622c6..4e53a2c17c4 100644
--- a/homeassistant/components/sensor/wsdot.py
+++ b/homeassistant/components/sensor/wsdot.py
@@ -26,7 +26,7 @@ ATTR_DESCRIPTION = 'Description'
 ATTR_TIME_UPDATED = 'TimeUpdated'
 ATTR_TRAVEL_TIME_ID = 'TravelTimeID'
 
-CONF_ATTRIBUTION = "Data provided by WSDOT"
+ATTRIBUTION = "Data provided by WSDOT"
 
 CONF_TRAVEL_TIMES = 'travel_time'
 
@@ -115,7 +115,7 @@ class WashingtonStateTravelTimeSensor(WashingtonStateTransportSensor):
     def device_state_attributes(self):
         """Return other details about the sensor state."""
         if self._data is not None:
-            attrs = {ATTR_ATTRIBUTION: CONF_ATTRIBUTION}
+            attrs = {ATTR_ATTRIBUTION: ATTRIBUTION}
             for key in [ATTR_AVG_TIME, ATTR_NAME, ATTR_DESCRIPTION,
                         ATTR_TRAVEL_TIME_ID]:
                 attrs[key] = self._data.get(key)
diff --git a/homeassistant/components/sensor/wunderground.py b/homeassistant/components/sensor/wunderground.py
index be42e10e894..74a4c2089b2 100644
--- a/homeassistant/components/sensor/wunderground.py
+++ b/homeassistant/components/sensor/wunderground.py
@@ -29,7 +29,8 @@ import homeassistant.helpers.config_validation as cv
 _RESOURCE = 'http://api.wunderground.com/api/{}/{}/{}/q/'
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by the WUnderground weather service"
+ATTRIBUTION = "Data provided by the WUnderground weather service"
+
 CONF_PWS_ID = 'pws_id'
 CONF_LANG = 'lang'
 
@@ -679,9 +680,7 @@ class WUndergroundSensor(Entity):
         self.rest = rest
         self._condition = condition
         self._state = None
-        self._attributes = {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
-        }
+        self._attributes = {ATTR_ATTRIBUTION: ATTRIBUTION}
         self._icon = None
         self._entity_picture = None
         self._unit_of_measurement = self._cfg_expand("unit_of_measurement")
diff --git a/homeassistant/components/sensor/yr.py b/homeassistant/components/sensor/yr.py
index 0cb9c3765ec..665c482f050 100644
--- a/homeassistant/components/sensor/yr.py
+++ b/homeassistant/components/sensor/yr.py
@@ -29,8 +29,8 @@ REQUIREMENTS = ['xmltodict==0.11.0']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Weather forecast from met.no, delivered " \
-                   "by the Norwegian Meteorological Institute."
+ATTRIBUTION = "Weather forecast from met.no, delivered by the Norwegian " \
+              "Meteorological Institute."
 # https://api.met.no/license_data.html
 
 SENSOR_TYPES = {
@@ -134,7 +134,7 @@ class YrSensor(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
         }
 
     @property
diff --git a/homeassistant/components/sensor/yweather.py b/homeassistant/components/sensor/yweather.py
index 243329680e1..349ee2c7aae 100644
--- a/homeassistant/components/sensor/yweather.py
+++ b/homeassistant/components/sensor/yweather.py
@@ -21,7 +21,8 @@ REQUIREMENTS = ['yahooweather==0.10']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Weather details provided by Yahoo! Inc."
+ATTRIBUTION = "Weather details provided by Yahoo! Inc."
+
 CONF_FORECAST = 'forecast'
 CONF_WOEID = 'woeid'
 
@@ -131,7 +132,7 @@ class YahooWeatherSensor(Entity):
     @property
     def device_state_attributes(self):
         """Return the state attributes."""
-        attrs = {ATTR_ATTRIBUTION: CONF_ATTRIBUTION}
+        attrs = {ATTR_ATTRIBUTION: ATTRIBUTION}
 
         if self._code is not None and "weather" in self._type:
             attrs['condition_code'] = self._code
diff --git a/homeassistant/components/sensor/zestimate.py b/homeassistant/components/sensor/zestimate.py
index a04df22cf07..ed3af84d396 100644
--- a/homeassistant/components/sensor/zestimate.py
+++ b/homeassistant/components/sensor/zestimate.py
@@ -22,8 +22,9 @@ REQUIREMENTS = ['xmltodict==0.11.0']
 _LOGGER = logging.getLogger(__name__)
 _RESOURCE = 'http://www.zillow.com/webservice/GetZestimate.htm'
 
+ATTRIBUTION = "Data provided by Zillow.com"
+
 CONF_ZPID = 'zpid'
-CONF_ATTRIBUTION = "Data provided by Zillow.com"
 
 DEFAULT_NAME = 'Zestimate'
 NAME = 'zestimate'
@@ -93,7 +94,7 @@ class ZestimateDataSensor(Entity):
         if self.data is not None:
             attributes = self.data
         attributes['address'] = self.address
-        attributes[ATTR_ATTRIBUTION] = CONF_ATTRIBUTION
+        attributes[ATTR_ATTRIBUTION] = ATTRIBUTION
         return attributes
 
     @property
diff --git a/homeassistant/components/skybell/__init__.py b/homeassistant/components/skybell/__init__.py
index 8724f7d3d66..31d1339fbcf 100644
--- a/homeassistant/components/skybell/__init__.py
+++ b/homeassistant/components/skybell/__init__.py
@@ -13,7 +13,7 @@ REQUIREMENTS = ['skybellpy==0.3.0']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Data provided by Skybell.com"
+ATTRIBUTION = "Data provided by Skybell.com"
 
 NOTIFICATION_ID = 'skybell_notification'
 NOTIFICATION_TITLE = 'Skybell Sensor Setup'
@@ -76,7 +76,7 @@ class SkybellDevice(Entity):
     def device_state_attributes(self):
         """Return the state attributes."""
         return {
-            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
+            ATTR_ATTRIBUTION: ATTRIBUTION,
             'device_id': self._device.device_id,
             'status': self._device.status,
             'location': self._device.location,
diff --git a/homeassistant/components/weather/met.py b/homeassistant/components/weather/met.py
index 90978314a20..3ddbe5aed75 100644
--- a/homeassistant/components/weather/met.py
+++ b/homeassistant/components/weather/met.py
@@ -17,8 +17,8 @@ REQUIREMENTS = ['pyMetno==0.4.5']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_ATTRIBUTION = "Weather forecast from met.no, delivered " \
-                   "by the Norwegian Meteorological Institute."
+ATTRIBUTION = "Weather forecast from met.no, delivered by the Norwegian " \
+              "Meteorological Institute."
 DEFAULT_NAME = "Met.no"
 
 URL = 'https://aa015h6buqvih86i1.api.met.no/weatherapi/locationforecast/1.9/'
@@ -50,8 +50,8 @@ async def async_setup_platform(hass, config, async_add_entities,
         'msl': str(elevation),
     }
 
-    async_add_entities([MetWeather(name, coordinates,
-                                   async_get_clientsession(hass))])
+    async_add_entities([MetWeather(
+        name, coordinates, async_get_clientsession(hass))])
 
 
 class MetWeather(WeatherEntity):
@@ -61,18 +61,16 @@ class MetWeather(WeatherEntity):
         """Initialise the platform with a data instance and site."""
         import metno
         self._name = name
-        self._weather_data = metno.MetWeatherData(coordinates,
-                                                  clientsession,
-                                                  URL
-                                                  )
+        self._weather_data = metno.MetWeatherData(
+            coordinates, clientsession, URL)
         self._current_weather_data = {}
         self._forecast_data = None
 
     async def async_added_to_hass(self):
         """Start fetching data."""
         await self._fetch_data()
-        async_track_utc_time_change(self.hass, self._update,
-                                    minute=31, second=0)
+        async_track_utc_time_change(
+            self.hass, self._update, minute=31, second=0)
 
     async def _fetch_data(self, *_):
         """Get the latest data from met.no."""
@@ -141,7 +139,7 @@ class MetWeather(WeatherEntity):
     @property
     def attribution(self):
         """Return the attribution."""
-        return CONF_ATTRIBUTION
+        return ATTRIBUTION
 
     @property
     def forecast(self):
diff --git a/homeassistant/components/weather/metoffice.py b/homeassistant/components/weather/metoffice.py
index 14738980482..3b52eebcff6 100644
--- a/homeassistant/components/weather/metoffice.py
+++ b/homeassistant/components/weather/metoffice.py
@@ -4,7 +4,7 @@ import logging
 import voluptuous as vol
 
 from homeassistant.components.sensor.metoffice import (
-    CONDITION_CLASSES, CONF_ATTRIBUTION, MetOfficeCurrentData)
+    CONDITION_CLASSES, ATTRIBUTION, MetOfficeCurrentData)
 from homeassistant.components.weather import PLATFORM_SCHEMA, WeatherEntity
 from homeassistant.const import (
     CONF_API_KEY, CONF_LATITUDE, CONF_LONGITUDE, CONF_NAME, TEMP_CELSIUS)
@@ -118,4 +118,4 @@ class MetOfficeWeather(WeatherEntity):
     @property
     def attribution(self):
         """Return the attribution."""
-        return CONF_ATTRIBUTION
+        return ATTRIBUTION