diff --git a/homeassistant/components/climate/honeywell.py b/homeassistant/components/climate/honeywell.py
index 0b2df903e17..253a5625ef3 100644
--- a/homeassistant/components/climate/honeywell.py
+++ b/homeassistant/components/climate/honeywell.py
@@ -11,16 +11,15 @@ import datetime
 import requests
 import voluptuous as vol
 
+import homeassistant.helpers.config_validation as cv
 from homeassistant.components.climate import (
     ClimateDevice, PLATFORM_SCHEMA, ATTR_FAN_MODE, ATTR_FAN_LIST,
     ATTR_OPERATION_MODE, ATTR_OPERATION_LIST)
 from homeassistant.const import (
     CONF_PASSWORD, CONF_USERNAME, TEMP_CELSIUS, TEMP_FAHRENHEIT,
-    ATTR_TEMPERATURE)
-import homeassistant.helpers.config_validation as cv
+    ATTR_TEMPERATURE, CONF_REGION)
 
-REQUIREMENTS = ['evohomeclient==0.2.5',
-                'somecomfort==0.4.1']
+REQUIREMENTS = ['evohomeclient==0.2.5', 'somecomfort==0.4.1']
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -31,7 +30,6 @@ ATTR_CURRENT_OPERATION = 'equipment_output_status'
 CONF_AWAY_TEMPERATURE = 'away_temperature'
 CONF_COOL_AWAY_TEMPERATURE = 'away_cool_temperature'
 CONF_HEAT_AWAY_TEMPERATURE = 'away_heat_temperature'
-CONF_REGION = 'region'
 
 DEFAULT_AWAY_TEMPERATURE = 16
 DEFAULT_COOL_AWAY_TEMPERATURE = 30
diff --git a/homeassistant/components/cloud/__init__.py b/homeassistant/components/cloud/__init__.py
index c711b00fdd2..c5d709d60c3 100644
--- a/homeassistant/components/cloud/__init__.py
+++ b/homeassistant/components/cloud/__init__.py
@@ -6,22 +6,23 @@ import os
 
 import voluptuous as vol
 
-from homeassistant.const import EVENT_HOMEASSISTANT_START
+from homeassistant.const import (
+    EVENT_HOMEASSISTANT_START, CONF_REGION, CONF_MODE)
 
 from . import http_api, iot
 from .const import CONFIG_DIR, DOMAIN, SERVERS
 
-
 REQUIREMENTS = ['warrant==0.5.0']
-DEPENDENCIES = ['http']
-CONF_MODE = 'mode'
+
+_LOGGER = logging.getLogger(__name__)
+
 CONF_COGNITO_CLIENT_ID = 'cognito_client_id'
-CONF_USER_POOL_ID = 'user_pool_id'
-CONF_REGION = 'region'
 CONF_RELAYER = 'relayer'
+CONF_USER_POOL_ID = 'user_pool_id'
+
 MODE_DEV = 'development'
 DEFAULT_MODE = MODE_DEV
-_LOGGER = logging.getLogger(__name__)
+DEPENDENCIES = ['http']
 
 CONFIG_SCHEMA = vol.Schema({
     DOMAIN: vol.Schema({
diff --git a/homeassistant/components/device_tracker/asuswrt.py b/homeassistant/components/device_tracker/asuswrt.py
index 9b214441ac9..f2d2a4c74b5 100644
--- a/homeassistant/components/device_tracker/asuswrt.py
+++ b/homeassistant/components/device_tracker/asuswrt.py
@@ -12,18 +12,17 @@ from collections import namedtuple
 
 import voluptuous as vol
 
+import homeassistant.helpers.config_validation as cv
 from homeassistant.components.device_tracker import (
     DOMAIN, PLATFORM_SCHEMA, DeviceScanner)
 from homeassistant.const import (
-    CONF_HOST, CONF_PASSWORD, CONF_USERNAME, CONF_PORT)
-import homeassistant.helpers.config_validation as cv
+    CONF_HOST, CONF_PASSWORD, CONF_USERNAME, CONF_PORT, CONF_MODE,
+    CONF_PROTOCOL)
 
 REQUIREMENTS = ['pexpect==4.0.1']
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_MODE = 'mode'
-CONF_PROTOCOL = 'protocol'
 CONF_PUB_KEY = 'pub_key'
 CONF_SSH_KEY = 'ssh_key'
 
@@ -36,10 +35,8 @@ PLATFORM_SCHEMA = vol.All(
     PLATFORM_SCHEMA.extend({
         vol.Required(CONF_HOST): cv.string,
         vol.Required(CONF_USERNAME): cv.string,
-        vol.Optional(CONF_PROTOCOL, default='ssh'):
-            vol.In(['ssh', 'telnet']),
-        vol.Optional(CONF_MODE, default='router'):
-            vol.In(['router', 'ap']),
+        vol.Optional(CONF_PROTOCOL, default='ssh'): vol.In(['ssh', 'telnet']),
+        vol.Optional(CONF_MODE, default='router'): vol.In(['router', 'ap']),
         vol.Optional(CONF_PORT, default=DEFAULT_SSH_PORT): cv.port,
         vol.Exclusive(CONF_PASSWORD, SECRET_GROUP): cv.string,
         vol.Exclusive(CONF_SSH_KEY, SECRET_GROUP): cv.isfile,
@@ -102,21 +99,18 @@ class AsusWrtDeviceScanner(DeviceScanner):
                 self.success_init = False
                 return
 
-            self.connection = SshConnection(self.host, self.port,
-                                            self.username,
-                                            self.password,
-                                            self.ssh_key,
-                                            self.mode == "ap")
+            self.connection = SshConnection(
+                self.host, self.port, self.username, self.password,
+                self.ssh_key, self.mode == 'ap')
         else:
             if not self.password:
                 _LOGGER.error("No password specified")
                 self.success_init = False
                 return
 
-            self.connection = TelnetConnection(self.host, self.port,
-                                               self.username,
-                                               self.password,
-                                               self.mode == "ap")
+            self.connection = TelnetConnection(
+                self.host, self.port, self.username, self.password,
+                self.mode == 'ap')
 
         self.last_results = {}
 
diff --git a/homeassistant/components/image_processing/openalpr_local.py b/homeassistant/components/image_processing/openalpr_local.py
index b0ef93611ea..ce06d98bf13 100644
--- a/homeassistant/components/image_processing/openalpr_local.py
+++ b/homeassistant/components/image_processing/openalpr_local.py
@@ -13,7 +13,7 @@ import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.core import split_entity_id, callback
-from homeassistant.const import STATE_UNKNOWN
+from homeassistant.const import STATE_UNKNOWN, CONF_REGION
 from homeassistant.components.image_processing import (
     PLATFORM_SCHEMA, ImageProcessingEntity, CONF_CONFIDENCE, CONF_SOURCE,
     CONF_ENTITY_ID, CONF_NAME, ATTR_ENTITY_ID, ATTR_CONFIDENCE)
@@ -46,7 +46,6 @@ OPENALPR_REGIONS = [
 ]
 
 CONF_ALPR_BIN = 'alp_bin'
-CONF_REGION = 'region'
 
 DEFAULT_BINARY = 'alpr'
 
diff --git a/homeassistant/components/input_number.py b/homeassistant/components/input_number.py
index 27aaa752950..856cdac1e4b 100644
--- a/homeassistant/components/input_number.py
+++ b/homeassistant/components/input_number.py
@@ -10,14 +10,14 @@ import logging
 
 import voluptuous as vol
 
-from homeassistant.config import load_yaml_config_file
 import homeassistant.helpers.config_validation as cv
+from homeassistant.config import load_yaml_config_file
 from homeassistant.const import (
-    ATTR_ENTITY_ID, ATTR_UNIT_OF_MEASUREMENT, CONF_ICON, CONF_NAME)
-from homeassistant.loader import bind_hass
+    ATTR_ENTITY_ID, ATTR_UNIT_OF_MEASUREMENT, CONF_ICON, CONF_NAME, CONF_MODE)
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.helpers.restore_state import async_get_last_state
+from homeassistant.loader import bind_hass
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -27,7 +27,6 @@ ENTITY_ID_FORMAT = DOMAIN + '.{}'
 CONF_INITIAL = 'initial'
 CONF_MIN = 'min'
 CONF_MAX = 'max'
-CONF_MODE = 'mode'
 CONF_STEP = 'step'
 
 MODE_SLIDER = 'slider'
@@ -180,7 +179,7 @@ def async_setup(hass, config):
 
 
 class InputNumber(Entity):
-    """Represent an slider."""
+    """Representation of a slider."""
 
     def __init__(self, object_id, name, initial, minimum, maximum, step, icon,
                  unit, mode):
diff --git a/homeassistant/components/sensor/google_travel_time.py b/homeassistant/components/sensor/google_travel_time.py
index fe0db29eb92..e7d25872701 100644
--- a/homeassistant/components/sensor/google_travel_time.py
+++ b/homeassistant/components/sensor/google_travel_time.py
@@ -14,7 +14,7 @@ from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.helpers.entity import Entity
 from homeassistant.const import (
     CONF_API_KEY, CONF_NAME, EVENT_HOMEASSISTANT_START, ATTR_LATITUDE,
-    ATTR_LONGITUDE)
+    ATTR_LONGITUDE, CONF_MODE)
 from homeassistant.util import Throttle
 import homeassistant.helpers.config_validation as cv
 import homeassistant.helpers.location as location
@@ -25,7 +25,6 @@ REQUIREMENTS = ['googlemaps==2.5.1']
 _LOGGER = logging.getLogger(__name__)
 
 CONF_DESTINATION = 'destination'
-CONF_MODE = 'mode'
 CONF_OPTIONS = 'options'
 CONF_ORIGIN = 'origin'
 CONF_TRAVEL_MODE = 'travel_mode'
diff --git a/homeassistant/components/sensor/uk_transport.py b/homeassistant/components/sensor/uk_transport.py
index bcac4b47279..9b35afb418c 100644
--- a/homeassistant/components/sensor/uk_transport.py
+++ b/homeassistant/components/sensor/uk_transport.py
@@ -6,13 +6,15 @@ https://home-assistant.io/components/sensor.uk_transport/
 import logging
 import re
 from datetime import datetime, timedelta
+
 import requests
 import voluptuous as vol
 
+import homeassistant.helpers.config_validation as cv
 from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import CONF_MODE
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
-import homeassistant.helpers.config_validation as cv
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -28,7 +30,6 @@ ATTR_NEXT_TRAINS = 'next_trains'
 CONF_API_APP_KEY = 'app_key'
 CONF_API_APP_ID = 'app_id'
 CONF_QUERIES = 'queries'
-CONF_MODE = 'mode'
 CONF_ORIGIN = 'origin'
 CONF_DESTINATION = 'destination'
 
diff --git a/homeassistant/components/switch/flux.py b/homeassistant/components/switch/flux.py
index a232702df39..ff432f2efc8 100644
--- a/homeassistant/components/switch/flux.py
+++ b/homeassistant/components/switch/flux.py
@@ -11,10 +11,12 @@ import logging
 
 import voluptuous as vol
 
+import homeassistant.helpers.config_validation as cv
 from homeassistant.components.light import (
     is_on, turn_on, VALID_TRANSITION, ATTR_TRANSITION)
 from homeassistant.components.switch import DOMAIN, SwitchDevice
-from homeassistant.const import CONF_NAME, CONF_PLATFORM, CONF_LIGHTS
+from homeassistant.const import (
+    CONF_NAME, CONF_PLATFORM, CONF_LIGHTS, CONF_MODE)
 from homeassistant.helpers.event import track_time_change
 from homeassistant.helpers.sun import get_astral_event_date
 from homeassistant.util import slugify
@@ -22,9 +24,6 @@ from homeassistant.util.color import (
     color_temperature_to_rgb, color_RGB_to_xy,
     color_temperature_kelvin_to_mired)
 from homeassistant.util.dt import now as dt_now
-import homeassistant.helpers.config_validation as cv
-
-DEPENDENCIES = ['light']
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -35,13 +34,14 @@ CONF_SUNSET_CT = 'sunset_colortemp'
 CONF_STOP_CT = 'stop_colortemp'
 CONF_BRIGHTNESS = 'brightness'
 CONF_DISABLE_BRIGTNESS_ADJUST = 'disable_brightness_adjust'
-CONF_MODE = 'mode'
 CONF_INTERVAL = 'interval'
 
 MODE_XY = 'xy'
 MODE_MIRED = 'mired'
 MODE_RGB = 'rgb'
 DEFAULT_MODE = MODE_XY
+DEPENDENCIES = ['light']
+
 
 PLATFORM_SCHEMA = vol.Schema({
     vol.Required(CONF_PLATFORM): 'flux',
diff --git a/homeassistant/const.py b/homeassistant/const.py
index e0e2691d44b..626dc3c8da4 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -117,8 +117,9 @@ CONF_LONGITUDE = 'longitude'
 CONF_LIGHTS = 'lights'
 CONF_MAC = 'mac'
 CONF_METHOD = 'method'
-CONF_MINIMUM = 'minimum'
 CONF_MAXIMUM = 'maximum'
+CONF_MINIMUM = 'minimum'
+CONF_MODE = 'mode'
 CONF_MONITORED_CONDITIONS = 'monitored_conditions'
 CONF_MONITORED_VARIABLES = 'monitored_variables'
 CONF_NAME = 'name'
@@ -135,10 +136,12 @@ CONF_PIN = 'pin'
 CONF_PLATFORM = 'platform'
 CONF_PORT = 'port'
 CONF_PREFIX = 'prefix'
+CONF_PROFILE_NAME = 'profile_name'
 CONF_PROTOCOL = 'protocol'
 CONF_PROXY_SSL = 'proxy_ssl'
 CONF_QUOTE = 'quote'
 CONF_RECIPIENT = 'recipient'
+CONF_REGION = 'region'
 CONF_RESOURCE = 'resource'
 CONF_RESOURCES = 'resources'
 CONF_RGB = 'rgb'
@@ -218,6 +221,9 @@ STATE_PROBLEM = 'problem'
 # Attribution
 ATTR_ATTRIBUTION = 'attribution'
 
+# Credentials
+ATTR_CREDENTIALS = 'credentials'
+
 # Contains time-related attributes
 ATTR_NOW = 'now'
 ATTR_DATE = 'date'