code: def AddTrack(self, uri, after_track, set_as_current):
          
          self.iface.AddTrack(uri,
                              convert2dbus(after_track, 'o'),
                              convert2dbus(set_as_current, 'b'))
docs: Adds a URI in the TrackList.
  
          :param str uri: The uri of the item to add.
          :param str after_track: The identifier of the track
                                  after which the new item should be inserted.
          :param bool set_as_current: Whether the newly inserted track
                                      should be considered as the current track.