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Using class argument as function decorator in Python

I have a Python class

class A:

    def __init__(self, auth):
        self.auth = auth

I want to use the auth variable as a function decorator but when I do something like below, it gives and error:

@self.auth.some_method()
def func(self):
    pass

the above does not work. Can someone please help with this. Thanks

I'd suggest doing something like this:

class A:
    def __base_func(self):
        pass

    def __init__(self, auth):
        self.auth = auth
        self.func = auth.some_method(self.__base_func)

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