Python 3.x 如何构建这个“类装饰器”？

我正在制作一个简单的装饰器，以大写形式输出返回值。这是我尝试的代码：

class UpperDecorator:
    def __init__(self, func, msg):
        self.func = func 
        self.msg = msg

    def __call__(self):
        res = self.func(self.msg)
        return res.upper()


@UpperDecorator
def message_app(msg):
    return msg

res = message_app('Hi')
print(res)

在运行代码时，我遇到以下错误：

TypeError: __init__() missing 1 required positional argument: 'msg'

TypeError: __call__() takes 1 positional argument but 2 were given

然后我稍微修改了构造函数（

def\uuuu init\uuu（self，func，msg=None）：

）并得到以下错误：

TypeError: __init__() missing 1 required positional argument: 'msg'

TypeError: __call__() takes 1 positional argument but 2 were given

---

请帮我解决它。谢谢

修饰函数的参数被传递到

\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

方法，而不是构造函数

\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

class UpperDecorator:
    def __init__(self, func):
        self.func = func

    def __call__(self, *args, **kwargs):
        res = self.func(*args, **kwargs)
        return res.upper()

@UpperDecorator
def message_app(msg):
    return msg

res = message_app('Hi')
print(res)

印刷品：

HI

修饰函数的参数被传递给
\uuuuu call\uuuuu
方法，而不是构造函数
\uuuuuu init\uuuuu
：

class UpperDecorator:
    def __init__(self, func):
        self.func = func

    def __call__(self, *args, **kwargs):
        res = self.func(*args, **kwargs)
        return res.upper()

@UpperDecorator
def message_app(msg):
    return msg

res = message_app('Hi')
print(res)

印刷品：

HI