code: def export(self):
          
          return {'id': self.id, 'name': self.name, 'artist': self._artist_name,
                  'artist_id': self._artist_id, 'album': self._album_name,
                  'album_id': self._album_id, 'track': self.track,
                  'duration': self.duration, 'popularity': self.popularity,
                  'cover': self._cover_url}
docs: Returns a dictionary with all song information.
          Use the :meth:`from_export` method to recreate the
          :class:`Song` object.