This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.


disjoint_union(G, H)[source]

Return the disjoint union of graphs G and H.

This algorithm forces distinct integer node labels.


G,H : graph

A NetworkX graph


U : A union graph with the same type as G.


A new graph is created, of the same class as G. It is recommended that G and H be either both directed or both undirected.

The nodes of G are relabeled 0 to len(G)-1, and the nodes of H are relabeled len(G) to len(G)+len(H)-1.

Graph, edge, and node attributes are propagated from G and H to the union graph. If a graph attribute is present in both G and H the value from H is used.