建造者模式

# 产品类，由多个组件组成
class Product(object):
    def __init__(self):
        self.L = []
    def Add(self,part):
        self.L.append(part)
    def show(self):
        print("产品 创建 -----")
        for i in self.L:
            print(i)

# 建造者类接口
class Builder(object):
    def partA(self): pass
    def partB(self): pass
    def get_result(self): pass

# 具体产品，具体建造者类
class Concrete1(Builder):
    def __init__(self):
        self.product = Product()
    def partA(self):
        self.product.Add("部件A")
    def partB(self):
        self.product.Add("部件B")
    def get_result(self):
        return self.product

class Concrete2(Builder):
    def __init__(self):
        self.product = Product()
    def partA(self):
        self.product.Add("部件X")
    def partB(self):
        self.product.Add("部件Y")
    def get_result(self):
        return self.product

# 指挥者
class Director(object):
    def construct(self,builder):
        builder.partA()
        builder.partB()
director = Director()
b1 = Concrete1()
b2 = Concrete2()
director.construct(b1)
p1 = b1.get_result()
p1.show()
director.construct(b2)
p2 = b2.get_result()
p2.show()

建造者