python 组合模式（示例）

#!/usr/bin/python # -*- coding:UTF-8 -*- """ 组合模式 Composite , 将对象组组合成树形结构以表示'部分-整体' 的层次结构.组合模式使得用户对单个对象的组合对象的使用具有一致性 """ from abc import ABCMeta, abstractmethod # 组合的对象声明接口,在适当情况下,实现所有类共有接口的默认行为,声明一个接口用于访问和管理Component的子部件 class Compoente(object): pass __metaclass__ = ABCMeta def __init__(self, name): self.name = name def Add(self, c): pass def Remove(self, c): pass def Display(self, deph): pass # 在组合中表示叶节点对象叶节点没有子节点 class Leaf(Compoente): pass # def __init__(self, name): # self.name = self.name def Add(self, c): print ("不能添加下级节点") def Remove(self, c): print ("不能删除下级节点") def Display(self, deph): pass strTemp = "" for i in range(deph): strTemp += strTemp + "-" print (deph, self.name) # 定义有枝节点的行为,用来储存子部件有关操作比如增加Add和Remove class Composite(Compoente): pass def __init__(self, name): self.name = name self.children = [] def Add(self, comp): self.children.append(comp) def Remove(self,comp): pass self.children.remove(comp) def Display(self, deph): strTemp = "" for i in range(deph): strTemp += strTemp + "-" print (deph, self.name) if __name__ == '__main__': pass #生成树根 root = Composite("这里是树根") root.Add("叶子1") root.Add("叶子2") root.Display(5) comp = Composite("Composite X") comp = ""