python 强制子类实现父类方法

from abc import ABCMeta, abstractmethod


class Payment(metaclass=ABCMeta):
    @abstractmethod
    def pay(self): pass


class Alipay(Payment):
    def pay(self):
        print(‘阿里pay‘)


class AA(Payment):
    def fukuan(self):
        print(‘没有调用pay方法‘)


alipay = Alipay()
alipay.pay()

aa = AA()
aa.fukuan()   # 报错