组合模式（python）

"""组合模式组合对象成树形结构以表示部分-整体结构在使用单个对象和组合对象时具有一致性"""from abc import ABCMeta, abstractmethodclass Company(object):    """    公司抽象类    """    __metaclass__ = ABCMeta    def __init__(self, name, duty):        self.name = name        self.zeren = duty        pass    @abstractmethod    def append(self, company):        pass    @abstractmethod    def remove(self, company):        pass    @abstractmethod    def display(self, num):        pass    @abstractmethod    def duty(self):        passclass Department(Company):    def __init__(self, name, duty):        super(Department, self).__init__(name, duty)    def append(self, company):        print("我不能添加子部门")    def remove(self, company):        print("我没有子部门删除")    def display(self, num):        string = ""        for i in range(num):            string += "-"        print(string + self.name)    def duty(self):        print(self.name + "   " + self.zeren)class ChildCompany(Company):    def __init__(self, name, duty):        super(ChildCompany, self).__init__(name, duty)        self.child_list = []    def append(self, company):        self.child_list.append(company)    def remove(self, company):        self.child_list.remove(company)    def display(self, num):        string = ""        for i in range(num):            string += "-"        print(string + self.name)        for child in self.child_list:            child.display(num + 2)    def duty(self):        print(self.name + "  " + self.zeren)        for child in self.child_list:            child.duty()if __name__ == '__main__':    root = ChildCompany("总公司", "管理整个公司")    renli = Department("人力资源部", "管理总公司人力")    caiwu = Department("财务部", "管理总公司财务")    root.append(renli)    root.append(caiwu)    shanghai = ChildCompany("上海分公司", "上海事物")    shanghai_renli = Department("上海人力资源部", "上海人力事务")    shanghai.append(shanghai_renli)    hangzhou = ChildCompany("杭州分公司", "杭州事务")    hangzhou_caiwu = Department("杭州财务部", "杭州财务")    hangzhou.append(hangzhou_caiwu)    fujian = Department("福建分公司", "福建事务")    fujian_xingzhen = Department("福建行政部", "福建行政")    fujian.append(fujian_xingzhen)    root.append(shanghai)    root.append(hangzhou)    root.append(fujian)    root.display(1)    print("")    root.duty()    print("")    print("")    root.remove(fujian)    root.display(2)    print("")    root.duty()