old_contents: """
  Support for ISY994 lights.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/light.isy994/
  """
  import logging
  from typing import Callable
  
  from homeassistant.components.light import (
      Light, SUPPORT_BRIGHTNESS, DOMAIN)
  from homeassistant.components.isy994 import ISY994_NODES, ISYDevice
  from homeassistant.helpers.typing import ConfigType
  
  _LOGGER = logging.getLogger(__name__)
  
  
  def setup_platform(hass, config: ConfigType,
                     add_entities: Callable[[list], None], discovery_info=None):
      """Set up the ISY994 light platform."""
      devices = []
      for node in hass.data[ISY994_NODES][DOMAIN]:
          devices.append(ISYLightDevice(node))
  
      add_entities(devices)
  
  
  class ISYLightDevice(ISYDevice, Light):
      """Representation of an ISY994 light device."""
  
      @property
      def is_on(self) -> bool:
          """Get whether the ISY994 light is on."""
          return self.value != 0
  
      @property
      def brightness(self) -> float:
          """Get the brightness of the ISY994 light."""
          return self.value
  
      def turn_off(self, **kwargs) -> None:
          """Send the turn off command to the ISY994 light device."""
          if not self._node.off():
              _LOGGER.debug("Unable to turn off light")
  
      # pylint: disable=arguments-differ
      def turn_on(self, brightness=None, **kwargs) -> None:
          """Send the turn on command to the ISY994 light device."""
          if not self._node.on(val=brightness):
              _LOGGER.debug("Unable to turn on light")
  
      @property
      def supported_features(self):
          """Flag supported features."""
          return SUPPORT_BRIGHTNESS
  
new_contents: """
  Support for ISY994 lights.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/light.isy994/
  """
  import logging
  from typing import Callable
  
  from homeassistant.components.light import (
      Light, SUPPORT_BRIGHTNESS, DOMAIN)
  from homeassistant.components.isy994 import ISY994_NODES, ISYDevice
  from homeassistant.helpers.typing import ConfigType
  
  _LOGGER = logging.getLogger(__name__)
  
  
  def setup_platform(hass, config: ConfigType,
                     add_entities: Callable[[list], None], discovery_info=None):
      """Set up the ISY994 light platform."""
      devices = []
      for node in hass.data[ISY994_NODES][DOMAIN]:
          devices.append(ISYLightDevice(node))
  
      add_entities(devices)
  
  
  class ISYLightDevice(ISYDevice, Light):
      """Representation of an ISY994 light device."""
  
      @property
      def is_on(self) -> bool:
          """Get whether the ISY994 light is on."""
          if self.is_unknown():
              return False
          return self.value != 0
  
      @property
      def brightness(self) -> float:
          """Get the brightness of the ISY994 light."""
          return None if self.is_unknown() else self.value
  
      def turn_off(self, **kwargs) -> None:
          """Send the turn off command to the ISY994 light device."""
          if not self._node.off():
              _LOGGER.debug("Unable to turn off light")
  
      # pylint: disable=arguments-differ
      def turn_on(self, brightness=None, **kwargs) -> None:
          """Send the turn on command to the ISY994 light device."""
          if not self._node.on(val=brightness):
              _LOGGER.debug("Unable to turn on light")
  
      @property
      def supported_features(self):
          """Flag supported features."""
          return SUPPORT_BRIGHTNESS
  
subject: Fix ISY blocking bug (#16978)