代理模式

from abc import ABCMeta, abstractmethod

class Card:
    def __init__(self):
        print('proxy interface')

    @abstractmethod
    def consume(self, account):
        pass

    @abstractmethod
    def getAccount(self):
        pass

    # @abstractmethod
    def transferAccount(self):
        raise NotImplementedError


class ATMProxy(Card):
    def __init__(self):
        self.bank = MingShengBank()

    def consume(self, account):
        self.account = self.getAccount

        if self.account < account:
            return('account is not enough')
        else:
            self.bank.consume(account)
            return(self.getAccount)

    @property
    def getAccount(self):
        return self.bank.getAccount()


class MingShengBank(Card):
    account =10

    def consume(self, account):
        self.account = self.account - account
        print('consume')

    def getAccount(self):
        return self.account

if __name__=='__main__':
    p = ATMProxy()
    print(p.getAccount)
    print(p.consume(2))
    print(p.consume(3))