old_contents: from __future__ import unicode_literals
  
  import spotifyconnect
  
  
  class Sink(object):
  
      def on(self):
          """Turn on the alsa_sink sink.
  
          This is done automatically when the sink is instantiated, so you'll
          only need to call this method if you ever call :meth:`off` and want to
          turn the sink back on.
          """
          assert spotifyconnect._session_instance.player.num_listeners(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY) == 0
          spotifyconnect._session_instance.player.on(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY, self._on_music_delivery)
  
      def off(self):
          """Turn off the alsa_sink sink.
  
          This disconnects the sink from the relevant session events.
          """
          spotifyconnect._session_instance.player.off(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY, self._on_music_delivery)
          assert spotifyconnect._session_instance.player.num_listeners(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY) == 0
          self._close()
  
      def _on_music_delivery(self, audio_format, frames, num_frames, pending, session):
          # This method is called from an internal libspotify thread and must
          # not block in any way.
          raise NotImplementedError
  
      def _close(self):
          pass
  
new_contents: from __future__ import unicode_literals
  
  import spotifyconnect
  
  __all__ = [
      'Sink'
  ]
  
  class Sink(object):
  
      def on(self):
          """Turn on the alsa_sink sink.
  
          This is done automatically when the sink is instantiated, so you'll
          only need to call this method if you ever call :meth:`off` and want to
          turn the sink back on.
          """
          assert spotifyconnect._session_instance.player.num_listeners(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY) == 0
          spotifyconnect._session_instance.player.on(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY, self._on_music_delivery)
  
      def off(self):
          """Turn off the alsa_sink sink.
  
          This disconnects the sink from the relevant session events.
          """
          spotifyconnect._session_instance.player.off(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY, self._on_music_delivery)
          assert spotifyconnect._session_instance.player.num_listeners(
              spotifyconnect.PlayerEvent.MUSIC_DELIVERY) == 0
          self._close()
  
      def _on_music_delivery(self, audio_format, frames, num_frames, pending, session):
          # This method is called from an internal libspotify thread and must
          # not block in any way.
          raise NotImplementedError
  
      def _close(self):
          pass
  
subject: Add Sink class to initial spotify-connect import