python\item方法

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‘]=18
print(f1.__dict__)
>>
{‘name‘: ‘sb‘, ‘age‘: 18}

f1[‘name‘]=‘alex‘  #设置对象的name
print(f1.__dict__)
>>
{‘name‘: ‘alex‘}

del f1.name
print(f1.__dict__)
>>
del obj.key时,我执行
{}