归一化设计

# -*- coding:utf-8 -*-


class Alipay():
    def __init__(self,money):
        self.money = money

    def pay(self):
        print('使用阿里支付了%s' % self.money)


class Jdpay():
    def __init__(self,money):
        self.money = money

    def pay(self):
        print('使用京东支付了%s' % self.money)


def pay(obj): # 定义一个函数，统一调用接口
    obj.pay()


a1 = Alipay(200)
j1 = Jdpay(100)
pay(a1)
pay(j1)