NetworkX

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networkx.Graph.number_of_nodes

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networkx.Graph.__len__

Graph.__len__()

Return the number of nodes. Use the expression ‘len(G)’.

Returns:

nnodes : int

The number of nodes in the graph.

Examples

>>> G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
>>> G.add_path([0,1,2,3])
>>> print len(G)
4