old_contents: """ Support for ISY994 lights. """
  # system imports
  import logging
  
  # homeassistant imports
  from homeassistant.components.isy994 import (ISYDeviceABC, ISY, SENSOR_STRING,
                                               HIDDEN_STRING)
  from homeassistant.components.light import ATTR_BRIGHTNESS
  from homeassistant.const import STATE_ON, STATE_OFF
  
  
  def setup_platform(hass, config, add_devices, discovery_info=None):
      """ Sets up the isy994 platform. """
      logger = logging.getLogger(__name__)
      devs = []
      # verify connection
      if ISY is None or not ISY.connected:
          logger.error('A connection has not been made to the ISY controller.')
          return False
  
      # import dimmable nodes
      for (path, node) in ISY.nodes:
          if node.dimmable and SENSOR_STRING not in node.name:
              if HIDDEN_STRING in path:
                  node.name += HIDDEN_STRING
              devs.append(ISYLightDevice(node))
  
      add_devices(devs)
  
  
  class ISYLightDevice(ISYDeviceABC):
      """ represents as isy light within home assistant. """
  
      _domain = 'light'
      _dtype = 'analog'
      _attrs = {ATTR_BRIGHTNESS: 'value'}
      _onattrs = [ATTR_BRIGHTNESS]
      _states = [STATE_ON, STATE_OFF]
  
new_contents: """
  homeassistant.components.light.isy994
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Support for ISY994 lights.
  """
  import logging
  
  from homeassistant.components.isy994 import (ISYDeviceABC, ISY, SENSOR_STRING,
                                               HIDDEN_STRING)
  from homeassistant.components.light import ATTR_BRIGHTNESS
  from homeassistant.const import STATE_ON, STATE_OFF
  
  
  def setup_platform(hass, config, add_devices, discovery_info=None):
      """ Sets up the ISY994 platform. """
      logger = logging.getLogger(__name__)
      devs = []
      # verify connection
      if ISY is None or not ISY.connected:
          logger.error('A connection has not been made to the ISY controller.')
          return False
  
      # import dimmable nodes
      for (path, node) in ISY.nodes:
          if node.dimmable and SENSOR_STRING not in node.name:
              if HIDDEN_STRING in path:
                  node.name += HIDDEN_STRING
              devs.append(ISYLightDevice(node))
  
      add_devices(devs)
  
  
  class ISYLightDevice(ISYDeviceABC):
      """ Represents as ISY light. """
  
      _domain = 'light'
      _dtype = 'analog'
      _attrs = {ATTR_BRIGHTNESS: 'value'}
      _onattrs = [ATTR_BRIGHTNESS]
      _states = [STATE_ON, STATE_OFF]
  
subject: update header