old_contents: import spytify
  
  from mopidy import settings
  from mopidy.backends.base import BaseBackend
  
  class SpotifyBackend(BaseBackend):
      def __init__(self, *args, **kwargs):
          super(SpotifyBackend, self).__init__(*args, **kwargs)
          self.spotify = spytify.Spytify(
              settings.SPOTIFY_USERNAME.encode('utf-8'),
              settings.SPOTIFY_PASSWORD.encode('utf-8'))
          self._playlist_load_cache = None
  
      def playlist_load(self, name):
          if not self._playlist_load_cache:
              for playlist in self.spotify.stored_playlists:
                  if playlist.name == name:
                      tracks = []
                      for track in playlist.tracks:
                          tracks.append(u'add %s\n' % track.file_id)
                      self._playlist_load_cache = tracks
                      break
          return self._playlist_load_cache
  
      def playlists_list(self):
          playlists = []
          for playlist in self.spotify.stored_playlists:
              playlists.append(u'playlist: %s' % playlist.name.decode('utf-8'))
          return playlists
  
      def url_handlers(self):
          return [u'spotify:', u'http://open.spotify.com/']
  
new_contents: import sys
  
  import spytify
  
  from mopidy import settings
  from mopidy.backends.base import BaseBackend
  
  class SpotifyBackend(BaseBackend):
      def __init__(self, *args, **kwargs):
          super(SpotifyBackend, self).__init__(*args, **kwargs)
          self.spotify = spytify.Spytify(self.username, self.password)
          self._playlist_load_cache = None
  
      @property
      def username(self):
          username = settings.SPOTIFY_USERNAME.encode('utf-8')
          if not username:
              sys.exit('Setting SPOTIFY_USERNAME is not set.')
          return username
  
      @property
      def password(self):
          password = settings.SPOTIFY_PASSWORD.encode('utf-8')
          if not password:
              sys.exit('Setting SPOTIFY_PASSWORD is not set.')
          return password
  
      def playlist_load(self, name):
          if not self._playlist_load_cache:
              for playlist in self.spotify.stored_playlists:
                  if playlist.name == name:
                      tracks = []
                      for track in playlist.tracks:
                          tracks.append(u'add %s\n' % track.file_id)
                      self._playlist_load_cache = tracks
                      break
          return self._playlist_load_cache
  
      def playlists_list(self):
          playlists = []
          for playlist in self.spotify.stored_playlists:
              playlists.append(u'playlist: %s' % playlist.name.decode('utf-8'))
          return playlists
  
      def url_handlers(self):
          return [u'spotify:', u'http://open.spotify.com/']
  
subject: Exit if SPOTIFY_{USERNAME,PASSWORD} is not set