code: def node_changed(self, node):
          
  
          index = self.get_node_index(node)
          if index is not None:
              self.dataChanged.emit(index, index)
              return True
          else:
              return False
docs: Calls :meth:`QAbstractItemModel.dataChanged` with given Node index.
  
          :param node: Node.
          :type node: AbstractCompositeNode or GraphModelNode
          :return: Method success.
          :rtype: bool