创建型模式-简单工厂模式

 

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from abc import ABCMeta,abstractmethod   class Payment(metaclass=ABCMeta):     # abstract class     @abstractmethod     def pay(self, money):         pass   class Alipay(Payment):     def pay(self, money):         print("支付宝支付%d元。"%money)       class WechatPay(Payment):     def pay(self, money):         print("微信支付%d元。"%money)   class PaymentFactory:     def create_payment(self, method):         if method == 'alipay':             return Alipay()         elif method == 'Wechat':             return WechatPay()         else:             raise TypeError("No such payment named %s" %method)   # client pf = PaymentFactory() p = pf.create_payment('alipay') p.pay(100)

　　

 如果改为：

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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 PaymentFactory:     def create_payment(self, method):         if method == 'alipay':             return Alipay()         elif method == 'Wechat':             return WechatPay()         elif method == 'huabei':             return Alipay(use_huabei=True)         else:             raise TypeError("No such payment named %s" %method)   # client pf = PaymentFactory() p = pf.create_payment('huabei') p.pay(100)

 

 

隐藏了类的内部实现。