Python设计模式之外观模式实例详解

#!/usr/bin/env python# -*- coding:utf-8 -*-__author__ = 'Andy'"""大话设计模式设计模式――外观模式facade_pattern.py外观模式(Facade Pattern):为子系统中的一组接口提供一个一致界面,此模式定义一个高层接口,使得子系统更加容易是用"""# 外观类class Fund(object):  def __init__(self):    self.stocka = StockA()    self.stockb = StockB()    self.realty = Realty()  def buy(self):    self.stocka.buy()    self.stockb.buy()    self.realty.buy()  def sell(self):    self.stocka.sell()    self.stockb.sell()    self.realty.sell()# 投资股票A类class StockA(object):  def buy(self):    print 'buy StockA'  def sell(self):    print 'sell StockA'# 投资股票B类class StockB(object):  def buy(self):    print 'buy StockB'  def sell(self):    print 'sell StockB'# 投资房地产class Realty(object):  def buy(self):    print 'buy Realty'  def sell(self):    print 'sell Realty'if __name__=="__main__":  fund = Fund()  fund.buy()  fund.sell()