Method update

recipes/Python/578615_graph/recipe-578615.py:382–393

Merges one graph with another. All vertices will be convertex to VertexType. Takes union of edge lists. >>> g1, g2 = Graph(VertexType=Vertex), Graph(VertexType=WVertex) >>> g1.add(1, [1, 2]) >>> g2.add(3, [2, 3]); g2.add(1, 2, 3); g2.add(1, 4, 2) >>> g1.update(g2)

(self, other, default=USE_DEFAULT, collision=MERGE_VERTEX)

        super(Graph, self).__init__(init, {}, MERGE_VERTEX)

    def update(self, other, default=USE_DEFAULT, collision=MERGE_VERTEX): #XXX could remove this if collision was attribute of defdict
        """Merges one graph with another.  All vertices will be convertex to VertexType.  Takes union of edge lists.
        >>> g1, g2 = Graph(VertexType=Vertex), Graph(VertexType=WVertex)
        >>> g1.add(1, [1, 2])
        >>> g2.add(3, [2, 3]); g2.add(1, 2, 3); g2.add(1, 4, 2)
        >>> g1.update(g2)   #XXX weight values get set on plain Vertex.
        >>> print g1
        {1: {1, 2, 4}, 2: {}, 3: {2, 3}, 4: {}}
        >>> g2.add(3, 5)  #changes to g2 should not affect g1
        >>> g1._validate()
        """
        super(Graph, self).update(other, default, collision)

    def add(self, head, tail=[], edge_value=VertexCommon.EDGEVALUE):
        """Add the vertices and/or edges.