(self, edge)
Remove an directed edge from the graph.

        @type  edge: tuple
        @param edge: Edge.
Remove an directed edge from the graph.
Remove an directed edge from the graph .
def del_edge(self, edge):
        """
        Remove an directed edge from the graph.

        @type  edge: tuple
        @param edge: Edge.
        """
        u, v = edge
        self.node_neighbors[u].remove(v)
        self.node_incidence[v].remove(u)
        self.del_edge_labeling( (u,v) )
def del_edge ( self , edge ) : u , v = edge self . node_neighbors [ u ] . remove ( v ) self . node_incidence [ v ] . remove ( u ) self . del_edge_labeling ( ( u , v ) )