创建型模式-工厂方法模式

from abc import ABCMeta,abstractmethod

class Payment(metaclass=ABCMeta):
    # abstract class
    @abstractmethod
    def pay(self, money):
        pass

class Alipay(Payment):
    def __init__(self, use_huabei=False):
        self.use_huabei = use_huabei
    def pay(self, money):
        if self.use_huabei:
            print("花呗支付%d元。"%money)
        else:
            print("支付宝余额支付%d元。"%money)

class WechatPay(Payment):
    def pay(self, money):
        print("微信支付%d元。"%money)

class BankPay(Payment):
    def pay(self, money):
        print("银行卡支付%d元。"%money)        

class PaymentFactory(metaclass=ABCMeta):
    @abstractmethod
    def create_payment(self):
        pass

class AlipayFactory(PaymentFactory):
    def create_payment(self):
        return Alipay()

class WechatPayFactory(PaymentFactory):
    def create_payment(self):
        return WechatPay()

class HuabeiFactory(PaymentFactory):
    def create_payment(self):
        return Alipay(use_huabei=True)

class BankPayFactory(PaymentFactory):
    def create_payment(self):
        return BankPay()
    
#client
pf = HuabeiFactory()
p = pf.create_payment()
p.pay(100)