建造者模式（python）

"""建造者模式对复杂对象进行构建过程和表现层的分离，使得一套构建过程能够创建出不同的对象产品"""from abc import ABCMeta, abstractmethodclass Food(object):    def __init__(self):        self._has_salt = 0        self._has_oil = 0        self._has_water = 0        pass    def set_salt(self, value):        self._has_salt = value    def set_oil(self, value):        self._has_oil = value    def set_water(self, value):        self._has_water = value    def eat(self):        if self._has_oil and self._has_water and self._has_salt:            print("评论：很好吃")        else:            print("评论：不能吃")class CookBuilder(object):    __metaclass__ = ABCMeta    def __init__(self):        pass    @abstractmethod    def put_salt(self):        pass    @abstractmethod    def put_oil(self):        pass    @abstractmethod    def put_water(self):        passclass GoodCookBuilder(CookBuilder):    def __init__(self):        super(GoodCookBuilder, self).__init__()        self.food = Food()    def put_salt(self):        print("放合适的盐")        self.food.set_salt(1)    def put_oil(self):        print("放合适的油")        self.food.set_oil(1)    def put_water(self):        print("放合适的水")        self.food.set_water(1)    def get_food(self):        return self.foodclass BadCookBuilder(CookBuilder):    def __init__(self):        super(BadCookBuilder, self).__init__()        self.food = Food()    def put_salt(self):        print("放太多盐")        self.food.set_salt(0)    def put_oil(self):        print("没放油")        self.food.set_oil(0)    def put_water(self):        print("水放的挺好")        self.food.set_water(1)    def get_food(self):        return self.foodclass CookDirector(object):    def __init__(self):        pass    def cook(self, cook_builder):        cook_builder.put_salt()        cook_builder.put_oil()        cook_builder.put_water()if __name__ == '__main__':    # 先有个大厨（指挥者）    cook_director = CookDirector()    # 有个做好吃饭的流程    good_cook_builder = GoodCookBuilder()    # 大厨指挥做好吃的饭    cook_director.cook(good_cook_builder)    # 把经过一系列做饭流程做好的饭拿出来    good_food = good_cook_builder.get_food()    # 吃下饭，发表意见    good_food.eat()    print("")    # ####做不好吃的饭    bad_cook_builder = BadCookBuilder()    cook_director.cook(bad_cook_builder)    bad_food = bad_cook_builder.get_food()    bad_food.eat()