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# node_attribute_xy

node_attribute_xy(G, attribute, nodes=None)

  Yields 2-tuples of node attribute values for all edges in `G`.

  This generator yields, for each edge in `G` incident to a node in `nodes`, a 2-tuple of form `(attribute value, attribute value)` for the parameter specified node-attribute.

  Parameters:
    G: NetworkX graph
    attribute: key

      The node attribute key.

    nodes: list or iterable (optional)

      Use only edges that are incident to specified nodes. The default is all nodes.

  Yields:
    (x, y): 2-tuple

      Generates 2-tuple of (attribute, attribute) values.

  Notes

  For undirected graphs, each edge is produced twice, once for each edge representation (u, v) and (v, u), with the exception of self-loop edges which only appear once.

  Examples

      >>> G = nx.DiGraph()
      >>> G.add_node(1, color="red")
      >>> G.add_node(2, color="blue")
      >>> G.add_node(3, color="green")
      >>> G.add_edge(1, 2)
      >>> list(nx.node_attribute_xy(G, "color"))
      [('red', 'blue')]