code: def remove_tracks(self, track_indices):
          
          if isinstance(track_indices, int):
              track_indices = [track_indices]
          self.tracks = [track for idx, track in enumerate(self.tracks)
                         if idx not in track_indices]
docs: Remove tracks specified by `track_indices`.
  
          Parameters
          ----------
          track_indices : list
              The indices of the tracks to be removed.