How can I get a class parameter from a function of class via decorator class?

Question

The problem: I want to get an attribute of class via decorator which is a class but I can not. The question is how can?

class DecoratorClass:

    def __call__(self, fn, *args, **kwargs) -> Callable:
        try:
            # do something with the TestClass value
            return fn
        finally:
            pass


class TestClass:

    def __init__(self):
        self.value = 1

    @DecoratorClass()
    def bar(self):
        return 1

How can I reach the the TestClass's value attr via DecoratorClass?

Answer 1

I got the solution :)

class Decoratorclass:

    def __call__(self, fn, *args, **kwargs) -> Callable:

        def decorated(instance):
            try:
                # do something with the TestClass value
                print(instance.value)
                return fn(instance)
            finally:
                pass
        return decorated

class TestClass:

    def __init__(self):
        self.value = 1

    @Decoratorclass()
    def bar(self):
        return 1