old_contents: # -*- coding: utf-8 -*-
  #
  # Copyright 2017-2018 Data61, CSIRO
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import networkx as nx
  
  
  class StellarGraph(nx.MultiDiGraph):
      """
      Our own StellarGraph class, inherited from nx.MultiDiGraph, with extra stuff to be added that's needed by samplers and mappers
      """
  
      pass
  
new_contents: # -*- coding: utf-8 -*-
  #
  # Copyright 2017-2018 Data61, CSIRO
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import networkx as nx
  
  
  class StellarGraph(nx.MultiGraph):
      """
      Our own class for heterogeneous undirected graphs, inherited from nx.MultiGraph, with extra stuff to be added that's needed by samplers and mappers
      """
  
      def __init__(self):
          super().__init__()
  
  
  class StellarDiGraph(nx.MultiDiGraph):
      """
      Our own class for heterogeneous directed graphs, inherited from nx.MultiDiGraph, with extra stuff to be added that's needed by samplers and mappers
      """
  
      def __init__(self):
          super().__init__()
  
  
  
subject: Split StellarGraph class into two: undirected and directed graph classes