code: def get_subgraph_list(self):
          
  
          sgraph_objs = list()
  
          for sgraph in self.obj_dict['subgraphs']:
                  obj_dict_list = self.obj_dict['subgraphs'][sgraph]
                  sgraph_objs.extend(
                      [Subgraph(obj_dict=obj_d)
                       for obj_d in obj_dict_list])
  
          return sgraph_objs
docs: Get the list of Subgraph instances.
  
          This method returns the list of Subgraph instances
          in the graph.