@serialized
    def on(self, event, listener, *user_args):
        if self._sp_playlist_callbacks is None:
            self._sp_playlist_callbacks = _PlaylistCallbacks.get_struct()
            lib.sp_playlist_add_callbacks(
                self._sp_playlist, self._sp_playlist_callbacks, ffi.NULL)
        if self != self._session._emitters:
            self._session._emitters.append(self)
        super(Playlist, self).on(event, listener, *user_args)
dataset/ETHPy150Open mopidy/pyspotify/spotify/playlist.py/Playlist.on/operator `not in` -> `!=`