networkx.algorithms.number_of_isolates¶

networkx.algorithms.number_of_isolates(G)[source]¶

Returns the number of isolates in the graph.

An isolate is a node with no neighbors (that is, with degree zero). For directed graphs, this means no in-neighbors and no out-neighbors.

Parameters:	G : NetworkX graph
Returns:	int The number of degree zero nodes in the graph G.