NetworkX

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networkx.DiGraph.has_node

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networkx.DiGraph.__contains__

DiGraph.__contains__(n)

Return True if n is a node, False otherwise. Use the expression ‘n in G’.

Examples

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