python的多重继承

# 多重继承，经典钻石继承

class A:
    def ping(self):
        print('ping', self)


class B(A):
    def pong(self):
        print('pong', self)


class C(A):
    def pong(self):
        print('PONG', self)


class D(B, C):
    def ping(self):
        super().ping()  # 按照MRO找到父类的ping方法
        print('post-ping:', self)

    def pingpong(self):
        self.ping()  # 执行自己的ping
        super().ping()
        self.pong()
        super().pong()