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# fnss.topologies.topology.Topology.has_node

`Topology.``has_node`(n)

  Return True if the graph contains the node n.

  Parameters: | n : node

  Examples

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

  It is more readable and simpler to use

      >>> 0 in G
      True

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