Method __setitem__

recipes/Python/578615_graph/recipe-578615.py:328–337

Set edge value. If tail does not exist, it is created and added to graph if necessary. >>> g = Graph() >>> g[1][2] = 3 #edge values ignored on plain Vertex >>> g[1][2] True

(self, tail, value)

    EDGEVALUE = True  #XXX doesn't get used -- Graph[v1][v2] returns 1 instead of True

    def __setitem__(self, tail, value):
        """Set edge value.  If tail does not exist, it is created and added to graph
        if necessary.

        >>> g = Graph()
        >>> g[1][2] = 3  #edge values ignored on plain Vertex
        >>> g[1][2]
        True
        """
        super(Vertex, self).__setitem__(tail, True)

    def __str__(self):
        """Return string of tail vertices in set notation.