to_undirected

Graph.to_undirected()

Return an undirected copy of the graph.

Returns:G – A deepcopy of the graph. Return type:Graph/MultiGraph

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=DiGraph(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

>>> G = nx.path_graph(2)   # or MultiGraph, etc
>>> H = G.to_directed()
>>> list(H.edges())
[(0, 1), (1, 0)]
>>> G2 = H.to_undirected()
>>> list(G2.edges())
[(0, 1)]