__getattribute__和item系列

# class Foo:
#     def __init__(self,x):
#         self.x=x
#
#     def __getattr__(self, item):
#         print('执行的是我')
#         # return self.__dict__[item]
#
# f1=Foo(10)
# # print(f1.x)
# f1.xxxxxx #不存在的属性访问，触发__getattr__

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

    def __getattr__(self, item):
        print('执行的是getattr')
        # return self.__dict__[item]
    # def __getattribute__(self, item):
    #     print('执行的是getattribute')
    #     raise AttributeError('抛出异常了')
        # raise TabError('xxxxxx')
f1=Foo(10)
# f1.x
f1.xxxxxx #不存在的属性访问，触发__getattr__

item系列

class Foo:
    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):
        print('delitem')
        self.__dict__.pop(key)

f1=Foo()
print(f1.__dict__)
# f1.name='egon'  #---->setattr-------->f1.__dict__['name']='egon'
f1['name']='egon'#--->setitem--------->f1.__dict__['name']='egon'
f1['age']=18

print('===>',f1.__dict__)

# del f1.name
# print(f1.__dict__)
#
# print(f1.age)
del f1['name']
print(f1.__dict__)

print(f1['age'])
raise S