old_contents: """
  Slack platform for notify component.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/notify.slack/
  """
  import logging
  
  from homeassistant.components.notify import DOMAIN, BaseNotificationService
  from homeassistant.const import CONF_API_KEY
  from homeassistant.helpers import validate_config
  
  REQUIREMENTS = ['slacker==0.9.10']
  _LOGGER = logging.getLogger(__name__)
  
  
  # pylint: disable=unused-variable
  def get_service(hass, config):
      """Get the Slack notification service."""
      import slacker
  
      if not validate_config({DOMAIN: config},
                             {DOMAIN: ['default_channel', CONF_API_KEY]},
                             _LOGGER):
          return None
  
      try:
          return SlackNotificationService(
              config['default_channel'],
              config[CONF_API_KEY])
  
      except slacker.Error:
          _LOGGER.exception(
              "Slack authentication failed")
          return None
  
  
  # pylint: disable=too-few-public-methods
  class SlackNotificationService(BaseNotificationService):
      """Implement the notification service for Slack."""
  
      def __init__(self, default_channel, api_token):
          """Initialize the service."""
          from slacker import Slacker
          self._default_channel = default_channel
          self._api_token = api_token
          self.slack = Slacker(self._api_token)
          self.slack.auth.test()
  
      def send_message(self, message="", **kwargs):
          """Send a message to a user."""
          import slacker
  
          channel = kwargs.get('target', self._default_channel)
          try:
              self.slack.chat.post_message(channel, message)
          except slacker.Error:
              _LOGGER.exception("Could not send slack notification")
  
new_contents: """
  Slack platform for notify component.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/notify.slack/
  """
  import logging
  
  from homeassistant.components.notify import DOMAIN, BaseNotificationService
  from homeassistant.const import CONF_API_KEY
  from homeassistant.helpers import validate_config
  
  REQUIREMENTS = ['slacker==0.9.10']
  _LOGGER = logging.getLogger(__name__)
  
  
  # pylint: disable=unused-variable
  def get_service(hass, config):
      """Get the Slack notification service."""
      import slacker
  
      if not validate_config({DOMAIN: config},
                             {DOMAIN: ['default_channel', CONF_API_KEY]},
                             _LOGGER):
          return None
  
      try:
          return SlackNotificationService(
              config['default_channel'],
              config[CONF_API_KEY])
  
      except slacker.Error:
          _LOGGER.exception(
              "Slack authentication failed")
          return None
  
  
  # pylint: disable=too-few-public-methods
  class SlackNotificationService(BaseNotificationService):
      """Implement the notification service for Slack."""
  
      def __init__(self, default_channel, api_token):
          """Initialize the service."""
          from slacker import Slacker
          self._default_channel = default_channel
          self._api_token = api_token
          self.slack = Slacker(self._api_token)
          self.slack.auth.test()
  
      def send_message(self, message="", **kwargs):
          """Send a message to a user."""
          import slacker
  
          channel = kwargs.get('target') or self._default_channel
          try:
              self.slack.chat.post_message(channel, message)
          except slacker.Error:
              _LOGGER.exception("Could not send slack notification")
  
subject: Fix problem with default channel