docs: def connections_from_graph(env, G, edge_data=False):
      """Create connections for agents in the given environment from the given
      NetworkX graph structure.
  
      :param env:
          Environment where the agents live. The environment should be derived
          from :class:`~creamas.core.environment.Environment`,
          :class:`~creamas.mp.MultiEnvironment` or
          :class:`~creamas.ds.DistributedEnvironment`.
  
      :param G:
          NetworkX graph structure, either :class:`networkx.graph.Graph` or
          :class:`networkx.digraph.DiGraph`. The graph needs to have the same
          number of nodes as the environment has agents (excluding the managers).
  
      :param bool edge_data:
          If ``True``, edge data from the given graph is copied to the agents'
          :attr:`connections`.
  
      .. note::
  
          By design, manager agents are excluded from the connections and should
          not be counted towards environment's agent count.
  
      The created connections are stored in each agent's
      :attr:`~creamas.core.agent.CreativeAgent.connections` and the possible
      edge data is stored as key-value pairs in the connection dictionary.
  
      The agents are sorted by their environments' hosts and ports before each
      agent is mapped to a node in **G**. This should cause some network
      generation methods in NetworkX, e.g.
      :func:`~networkx.generators.random_graphs.connected_watts_strogatz_graph`,
      to create more connections between agents in the same environment and/or
      node when using :class:`~creamas.mp.MultiEnvironment` or
      :class:`~creamas.ds.DistributedEnvironment`.
      """
      if not issubclass(G.__class__, (Graph, DiGraph)):
          raise TypeError("Graph structure must be derived from Networkx's "
                          "Graph or DiGraph.")
      if not hasattr(env, 'get_agents'):
          raise TypeError("Parameter 'env' must have get_agents.")
  
      addrs = env.get_agents(addr=True)
      if len(addrs) != len(G):
          raise ValueError("The number of graph nodes and agents in the "
                           "environment (excluding the manager agent) must "
                           "match. Now got {} nodes and {} agents."
                           .format(len(G), len(addrs)))
      # Sort agent addresses to the order they were added to the environment.
      addrs = sort_addrs(addrs)
      _addrs2nodes(addrs, G)
      conn_map = _edges2conns(G, edge_data)
      env.create_connections(conn_map)