最近正在持续更新源码库，代码都是参考大话设计模式翻成python版，完整代码片段请到github上去下载.

https://github.com/zhengtong0898/python-patterns

参考：

    书籍<<大话设计模式>> 第二章 2.5  --  2.6 小节

Python 3.x

# -.- coding:utf-8 -.-# __author__ = 'zhengtong'# 知识点：面向对象的编程，并不是类越多越好，类的划分是为了封装，#         但分类的基础是抽象，具有相同属性和功能的对象的抽象集合才是类。_price_repr = '单价：'_number_repr = '数量：'_total_repr = '合计：'class Strategy:    """    策略和简单工厂的结合    这里将原来的CashFactory工厂中的代码进行了整合.    """    def __init__(self, typed, **kwargs):        if typed == 1:            self.result = CashNormal(**kwargs)        elif typed == 2:            self.result = CashReturn(300, 100, **kwargs)        elif typed == 3:            self.result = CashRebate(0.8, **kwargs)        else:            raise KeyError('无效的返利选择')    def get_result(self):        return self.result.accept_cash()class CashSuper:    """现金收取类(抽象类)"""    def __init__(self, money):        self.money = money    def accept_cash(self):        raise NotImplementedErrorclass CashNormal(CashSuper):    """正常收费子类"""    def accept_cash(self):        return self.moneyclass CashRebate(CashSuper):    """打折收费子类"""    def __init__(self, rebate, **kwargs):        """        这里为什么采用**kwargs, 请参考下面这个链接:        http://my.oschina.net/zhengtong0898/blog/670917        """        super(CashRebate, self).__init__(**kwargs)        self.rebate = rebate    def accept_cash(self):        return self.money * self.rebateclass CashReturn(CashSuper):    """返利收费子类"""    def __init__(self, condition, money_return, **kwargs):        super(CashReturn, self).__init__(**kwargs)        self.condition = int(condition)        self.money_return = int(money_return)    def accept_cash(self):        result = self.money        # 当满足了返利条件, 则采用计算规则.        if self.money >= self.condition:            result = self.money - int(self.money / self.condition) * self.money_return        return resultdef main():    result = 0    while True:        try:            prices = int(input(_price_repr))            number = int(input(_number_repr))            price_off = int(input('返利模式: 1(正常收费), 2(满300返100), 3(打8折)：'))            money = Strategy(price_off, money=prices*number).get_result()            result += money            print(_price_repr, prices, _number_repr, number, _total_repr, money)        except KeyboardInterrupt:            print('')            print('oops: 检测到Ctrl + C组合键, 正在返回总费用并推出程序')            break    return resultif __name__ == '__main__':    print('温馨提示：输入Ctrl + C组合键可得到总数和退出程序.')    print(main())