disjoint_union_all

disjoint_union_all(graphs)

Returns the disjoint union of all graphs.

This operation forces distinct integer node labels starting with 0 for the first graph in the list and numbering consecutively.

Parameters:

graphslist

List of NetworkX graphs

Returns:

UA graph with the same type as the first graph in list

Raises:

ValueError

If graphs is an empty list.

Notes

It is recommended that the graphs be either all directed or all undirected.

Graph, edge, and node attributes are propagated to the union graph. If a graph attribute is present in multiple graphs, then the value from the last graph in the list with that attribute is used.