class Foo:    def __init__(self,name):        self.name=name    def __getitem__(self, item):        print(self.__dict__[item])    def __setitem__(self, key, value):        self.__dict__[key]=value    def __delitem__(self, key):        print(‘del obj[key]时,我执行‘)        self.__dict__.pop(key)    def __delattr__(self, item):        print(‘del obj.key时,我执行‘)        self.__dict__.pop(item)f1=Foo(‘sb‘)f1[‘age‘]=18f1[‘age1‘]=19del f1.age1del f1[‘age‘]f1[‘name‘]=‘alex‘print(f1.__dict__)

#把对象操作属性模拟成字典的格式class Foo:    def __init__(self,name):        self.name=name    def __setattr__(self, key, value):        print(‘setattr===>‘)    def __getitem__(self, item):        # print(‘getitem‘,item)        return self.__dict__[item]    def __setitem__(self, key, value):        print(‘setitem-----<‘)        self.__dict__[key]=value    def __delitem__(self, key):        self.__dict__.pop(key)        # self.__dict__.pop(key)    # def __delattr__(self, item):    #     print(‘del obj.key时,我执行‘)    #     self.__dict__.pop(item)f=Foo(‘egon‘)f.name=‘egonlin‘f[‘name‘]=‘egonlinhai‘# print(f.name)# f.name=‘egonlin‘# f[‘age‘]=18# print(f.__dict__)## del f[‘age‘] #del f.age# print(f.__dict__)# print(f[‘name‘])