PlanarEmbedding.number_of_nodes# PlanarEmbedding.number_of_nodes()# Returns the number of nodes in the graph. Returns: nnodesintThe number of nodes in the graph. See also orderidentical method __len__identical method Examples >>> G = nx.path_graph(3) # or DiGraph, MultiGraph, MultiDiGraph, etc >>> G.number_of_nodes() 3