python 工厂模式

"""
简单工厂模式不是23中设计模式中的，但是必须要知道。简单工厂模式不直接向客户端暴露对象创建的细节，而是通过一个工厂类来负责
创建产品类的实例。简单工程模式的角色有：工厂角色、抽象产品角色、具体产品角色，通过例子来加深理解：
"""

from abc import ABCMeta, abstractmethod

# 抽象产品角色，以什么样的表现去使用
class Payment(metaclass=ABCMeta):

    @abstractmethod
    def pay(self, money):
        pass


# 产品角色
class Alipay(Payment):
    def __init__(self, use_huabei=False):
        self.use_huabei = use_huabei

    def pay(self, money):
        if self.use_huabei:
            print("花呗支付了{0}".format(money))
        else:
            print("支付宝支付了{0}".format(money))


# 产品角色
class WechatPay(Payment):
    def pay(self, money):
        print("微信支付了{0}".format(money))


# 工厂类角色
class PaymentFactory(object):
    def create_payment(self, method):
        print(method)
        if method == 'Alipay':
            return Alipay()
        elif method == "WechatPay":
            return WechatPay()
        elif method == "HuabeiPay":
            return Alipay(use_huabei=True)
        else:
            raise TypeError('No such payment named %s' % method)


pf = PaymentFactory()
pf.create_payment("Alipay").pay("100")
a = Alipay()

   工厂模式

from abc import ABCMeta, abstractmethod


# 抽象产品
class PayMent(metaclass=ABCMeta):
    @abstractmethod
    def pay(self, money):
        pass


# 具体产品
class AlipayMent(PayMent):
    def __init__(self, use_huabei=False):
        self.use_huabei = use_huabei

    def pay(self, money):
        if self.use_huabei:
            print("huawei支付{}".format(money))
        else:
            print("alipay支付{}".format(money))


class WechatMent(PayMent):
    def pay(self, money):
        print("wechat支付{}".format(money))


# 抽象工厂
class PayMentFactory(metaclass=ABCMeta):
    @abstractmethod
    def create_payment(self):
        pass


# 具体工厂角色
class AlipayFactory(PayMentFactory):
    def create_payment(self):
        return AlipayMent()


class WechatFactory(PayMentFactory):
    def create_payment(self):
        return WechatMent()


class HuabeiFactory(PayMentFactory):
    def create_payment(self):
        return AlipayMent(use_huabei=True)


A = HuabeiFactory().create_payment()
A.pay('100')