自写的简单版实现返回的函数名就是原始func函数名的类装饰器

class Decorate(object):
    def __init__(self, func):
        print('装饰器初始化',func.__name__)
        self.__func = func
        self.__name__ = Decorate.__name__

    @classmethod
    def set_name(cls,update_func):
        cls.__name__ = update_func.__name__
        print(cls.__name__)
        return cls

    def __call__(self, *args, **kwargs):
        print('装饰器功能')
        self.__func(*args, **kwargs)

def decorate(func):
    @Decorate.set_name(func)
    def wrapping(*args,**kwargs):
        print('执行函数',func.__name__)
        return func(*args,**kwargs)
    return wrapping

@decorate
def test(a,b):
    print(a+b)

test(2,3)
print('返回的函数名',test.__name__)