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# fnss.topologies.topology.Topology.to_undirected

`Topology.``to_undirected`()

  Return an undirected copy of the topology.

  Returns: | topology : Topology A undirected copy of the topology.

  See also

  `copy`, `add_edge`, `add_edges_from`

  Notes

  This returns a ‘deepcopy’ of the edge, node, and graph attributes which attempts to completely copy all of the data and references.

  This is in contrast to the similar G=Topology(D) which returns a shallow copy of the data.

  See the Python copy module for more information on shallow and deep copies, http://docs.python.org/library/copy.html.

  Examples

      >>> topo = Topology()   # or MultiGraph, etc
      >>> topo.add_path([0,1])
      >>> topo2 = topo.to_directed()
      >>> topo2.edges()
      [(0, 1), (1, 0)]
      >>> topo3 = topo2.to_undirected()
      >>> topo3.edges()
      [(0, 1)]

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