Python责任链模式

责任链模式，子对象都有一个父对象，请求从一级一级从下向顶级父对象传递。

class One(object):
    def __init__(self, name, next=None):
        super().__init__()
        self.name = name
        self.next = next

    def do(self):
        print(self.name, "do")
        self.top()

    def top(self):
        if self.next:
            self.next.do()


def main():
    one_a = One("a")
    one_b = One("b", one_a)
    one_c = One("c", one_b)
    one_c.do()


if __name__ == '__main__':
    main()