(self , point_a , point_b)
add point a to b edge
        param: point_a:point              图点a -> b
            param: point_b              图被指向点
            return:None
add point a to b edge
        param: point_a:point              图点a -> b
            param: point_b              图被指向点
            return:None
add point a to b edge param : point_a : point 图点a - > b param : point_b 图被指向点 return : None
def add_edge(self , point_a , point_b):
        """add point a to b edge
        param: point_a:point              图点a -> b
            param: point_b              图被指向点
            return:None
        """
        self.data[point_a][point_b] = 1
        self.outs_counter[point_a] += 1
        self.point_ins[point_b].add(point_a)
def add_edge ( self , point_a , point_b ) : self . data [ point_a ] [ point_b ] = 1 self . outs_counter [ point_a ] += 1 self . point_ins [ point_b ] . add ( point_a )