code: def append_clusters(self, clusters, data=None, marker='.', markersize=None):
          
  
          for cluster in clusters:
              self.append_cluster(cluster, data, marker, markersize)
docs: !
          @brief Appends list of cluster for visualization.
  
          @param[in] clusters (list): List of clusters where each cluster may consist of indexes of objects from the data or object itself.
          @param[in] data (list): If defines that each element of cluster is considered as a index of object from the data.
          @param[in] marker (string): Marker that is used for displaying objects from clusters on the canvas.
          @param[in] markersize (uint): Size of marker.