Python类：抽象类、接口类

from abc import ABCMeta,abstractmethod
class Payment(metaclass=ABCMeta):  # 抽象类(接口类):
    @abstractmethod
    def pay(self): pass  # 制定了一个规范
    # @abstractmethod
    # def func(self):pass

class Alipay(Payment):
    def __init__(self,money):
        self.money = money
    def pay(self):
        print(‘使用支付宝支付了%s‘ %self.money)

class Jdpay(Payment):
    def __init__(self, money):
        self.money = money
    def pay(self):
        print(‘使用京东支付了%s‘ % self.money)

class Wechatpay(Payment):
    def __init__(self,money):
        self.money = money
    def pay(self):
        print(‘使用微信支付了%s‘ % self.money)

def pay(obj):
    obj.pay()

# w1 = Wechatpay(200)
a1 = Alipay(200)
j1 = Jdpay(100)
pay(a1)  # 归一化设计
pay(j1)