问题描述
我想使用构建器和原型模式创建简单的应用程序来建造不同的房子。
(1) 修改程序,我在create_house方法中添加了name self._builder.name()
属性,为我们设置了房子的名字。
但是,意外收到错误:AttributeError: 'House1' object has no attribute 'name
'。我不知道为什么会发生这种情况,因为我认为我已经正确定义了所有内容。
class Director():
def __init__(self,builder):
self._builder = builder
def create_house(self):
self._builder.name()
self._builder.create_new_house()
self._builder.add_basement()
self._builder.add_rooms()
self._builder.add_roof()
def get_house(self):
return self._builder.house
class Builder():
def __init__(self):
self.house = None
def create_new_house(self):
self.house = House()
class House1(Builder):
def add_name(self):
self.house.name = 'house1'
def add_basement(self):
self.house.basement = 'with basement'
def add_roof(self):
self.house.roof = 'wood roof'
def add_rooms(self):
self.house.rooms = 3
class House2(Builder):
def add_name(self):
self.house.name = 'house2'
def add_basement(self):
self.house.basement = 'no basement'
def add_roof(self):
self.house.roof = 'brick roof'
def add_rooms(self):
self.house.rooms = 5
class House():
def __init__(self):
self.name = None
self.basement = None
self.roof = None
self.rooms = None
def __str__(self):
return 'Building: {} {},{},and {} room'.format(self.name,self.basement,self.roof,self.rooms)
builder = WoodHouse()
director = Director(builder)
director.create_house()
house = director.get_house()
print(house)
(2) 顺便问一下,我是否可以改进(少写)称为“建造”房屋的过程。 我的意思是这段代码,如果我创建,例如,3 个这样的房子,我必须重复它,但是,这是非常不可读和不方便的。
builder = WoodHouse()
director = Director(builder)
director.create_house()
house = director.get_house()
print(house)
解决方法
只需使用 for 循环。
for builder in [WoodHouse(),BrickHouse()]:
director = Director(builder)
director.create_house()
house = director.get_house()
print(house)