工厂方法

创造者模式

---

抽象产品

from abc import ABCMeta, abstractmethod

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

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具体产品

# 支付宝 
class Alipay(Payment):
    def __init__(self, user_huabei=False):
        self.user_huabei = user_huabei  # 花呗

    def pay(self, money):
        if self.user_huabei:
            print(f'支付宝花呗付款{money}元')
        else:
            print(f'支付宝付款{money}元')

# 微信
class WechatPay(Payment):
    def pay(self, money):
        print(f'微信付款{money}元')

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抽象工厂

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

具体工厂

隐藏了对象创建的实现细节

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(user_huabei=True)

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客户端

pf = HuabeiFactory()
p = pf.create_payment()
p.pay(100)