python内置方法__getitem__,__delitem__,__setitem__

class Foo:
    def __init__(self,name):
        self.name = name

    def __getitem__(self,item):
        print('getitem')
        print(item)
        return self.__dict__.get[item]

    def __setitem__(self,key,value):
        print('setitem,,,,,',key,value)
        self.__dict__[key] = value
        print(key,value)

    def __delitem__(self, key):
        print('delitem,,,,')
        self.__dict__.pop(key)
        print(key)

obj = Foo('egon')
print(obj.name)
obj['name'] = 'alex'
print(obj.name)
print(obj.__dict__)
del obj['name']

输出:

egon
setitem,,,,, name alex
name alex
alex
{'name': 'alex'}
delitem,,,,
name