设计模式十三（外观模式，python语言实现）
基本原理请参考相关书籍，这里直接给实例
基本说明：外观模式不改变原有系统的结构，通过组建外观类提供对外交互的复杂工作。
今天上班老板交代两项工作：1.安排人扫雪。2.安派人准备接待参观考察团
公司原有的机构共三个部门A,B,C
为了完成老板安排的任务，我只好充当外观类，安排A,C部门扫雪（雪很大，需要两个部门），安排B部门接待参观（B部门姐姐，妹妹多能营造氛围）
# -*- coding: utf-8 -*-######################################################## # Facade.py# Python implementation of the Class client# Generated by Enterprise Architect# Created on: 12-十二月-2012 10:52:19# Original author: zjm# #######################################################from __future__ import divisionfrom __future__ import print_functionfrom __future__ import unicode_literalsfrom future_builtins import * class Department(object): """This class (a) implements subsystem functionality, (b) handles work assigned by the Facade object, and (c) keeps no reference to the facade. """ def __init__(self, name="None"): self.name=name pass def Operation(self): print(self.name+ " "+"does this work") passclass DepartmentA(Department): """This class (a) implements subsystem functionality, (b) handles work assigned by the Facade object, and (c) keeps no reference to the facade. """ def __init__(self, name="DepartmentA"): super(DepartmentA,self).__init__(name) passclass DepartmentB(Department): """This class (a) implements subsystem functionality, (b) handles work assigned by the Facade object, and (c) keeps no reference to the facade. """ def __init__(self, name="DepartmentB"): super(DepartmentB,self).__init__(name) passclass DepartmentC(Department): """This class (a) implements subsystem functionality, (b) handles work assigned by the Facade object, and (c) keeps no reference to the facade. """ def __init__(self, name="DepartmentC"): super(DepartmentC,self).__init__(name) passclass Facade(object): """This class (a) knows which subsystem classes are responsible for a request, and (b) delegates client requests to appropriate subsystem objects. """ m_DepartmentA= DepartmentA() m_DepartmentB= DepartmentB() m_DepartmentC= DepartmentC() def __init__(self): self.m_DepartmentA= DepartmentA() self.m_DepartmentB= DepartmentB() self.m_DepartmentC= DepartmentC() def CleanSnow(self): print("CleanSnow:") self.m_DepartmentA.Operation() self.m_DepartmentC.Operation() pass def ReceiveVisit(self): print("ReceiveVisit:") self.m_DepartmentB.Operation() pass#客户端（老板） if(__name__=="__main__"): class client: m_Facade= Facade() m_Facade.CleanSnow() m_Facade.ReceiveVisit() 运行结果：
