Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

networkx.algorithms.operators.all.disjoint_union_all

disjoint_union_all(graphs)[source]

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

graphs (list) – List of NetworkX graphs

Returns

U

Return type

A 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.