Python设计模式之建造者模式

建造者模式学习链接

#!/usr/bin/python
# coding:utf8
"""
建造者模式
"""
#encoding=utf-8
__author__ = '[email protected]'
from abc import ABCMeta, abstractmethod


class Builder():
    __metaclass__ = ABCMeta

    @abstractmethod
    def draw_left_arm(self):
        pass

    @abstractmethod
    def draw_right_arm(self):
        pass

    @abstractmethod
    def draw_left_foot(self):
        pass

    @abstractmethod
    def draw_right_foot(self):
        pass

    @abstractmethod
    def draw_head(self):
        pass

    @abstractmethod
    def draw_body(self):
        pass


class Thin(Builder):
    def draw_left_arm(self):
        print '画左手'

    def draw_right_arm(self):
        print '画右手'

    def draw_left_foot(self):
        print '画左脚'

    def draw_right_foot(self):
        print '画右脚'

    def draw_head(self):
        print '画头'

    def draw_body(self):
        print '画瘦身体'


class Fat(Builder):
    def draw_left_arm(self):
        print '画左手'

    def draw_right_arm(self):
        print '画右手'

    def draw_left_foot(self):
        print '画左脚'

    def draw_right_foot(self):
        print '画右脚'

    def draw_head(self):
        print '画头'

    def draw_body(self):
        print '画胖身体'


class Director():
    def __init__(self, person):
        self.person=person

    def draw(self):
        self.person.draw_left_arm()
        self.person.draw_right_arm()
        self.person.draw_left_foot()
        self.person.draw_right_foot()
        self.person.draw_head()
        self.person.draw_body()


if __name__=='__main__':
    thin=Thin()
    fat=Fat()
    director_thin=Director(thin)
    director_thin.draw()
    director_fat=Director(fat)
    director_fat.draw()

from abc import ABCMeta, abstractmethod 方法就可以控制子类必须实现父类的抽象方法，这样就可以控制代码