建造者模式

将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示

from abc import ABCMeta, abstractmethod

class Player(object):
    def __init__(self, face=None, body=None, arm=None, leg=None):
        self.face = face
        self.body = body
        self.arm = arm
        self.leg = leg

    def __str__(self):
        return "%s, %s, %s, %s" % (self.face, self.body, self.arm, self.leg)

class PlayerBuilder(metaclass=ABCMeta):
    @abstractmethod
    def build_face(self):
        pass

    @abstractmethod
    def build_body(self):
        pass

    @abstractmethod
    def build_arm(self):
        pass

    @abstractmethod
    def build_leg(self):
        pass

# 控制组装顺序
class PlayerDirector(object):
    @staticmethod
    def build_player(builder):
        builder.build_body()
        builder.build_face()
        builder.build_arm()
        builder.build_leg()
        return builder.player

class SexyGirl(PlayerBuilder):
    def __init__(self):
        self.player = Player()

    def build_face(self):
        self.player.face = '漂亮脸蛋'

    def build_body(self):
        self.player.body = '苗条'

    def build_arm(self):
        self.player.arm = '细长'

    def build_leg(self):
        self.player.leg = '大长腿'

builder = SexyGirl()
director = PlayerDirector()
player = director.build_player(builder)
print(player)

建造者模式与抽象工厂模式相似，也用来创建复杂对象。 主要区别是建造者模式着重一步步构造一个复杂对象，而抽象工厂模式着重于多个系列产品对象。

优点：

• 隐藏了一个产品的内部结构和装配过程

• 将构造代码与表示代码分开

• 可以对构造过程进行更精细的控制