python3 面向对象高级一些的

class Foo:
    def __init__(self,name):
        self.name=name
    def __call__(self, *args, **kwargs):
        print('====>')
f=Foo('egon')
f()

class Foo:
    def __init__(self,name):
        self.name=name
    def __getitem__(self,item):
        print('getitem',self.__dict__)
        return self.__dict__[item]
    def __setitem__(self, key, value):
        print('setimtem')
        self.__dict__[key]=value
    def __delitem__(self, key):
        print('del obj[key]时,我执行')
        self.__dict__.pop(key)
f=Foo('egon')
# print(f['name']) #f.name
f['x']=1
# print(f.__dict__)
del f['x']
print(f.__dict__)

f1=Foo('sb')
f1['age']=18
f1['age1']=19
del f1.age1
del f1['age']
f1['name']='alex'
print(f1.__dict__)

====>
setimtem
del obj[key]时,我执行
{'name': 'egon'}
setimtem
setimtem
del obj[key]时,我执行
setimtem
{'name': 'alex'}