Class and static methods

[koxu1996]

Let's suppose I have following class:

class Test():
    @staticmethod
    def a():
        return 'a'

    @classmethod
    def b(cls):
        return 'b'

I tried to attach pre/post function, but I am getting error:
'classmethod' object is not callable
Is there possibility to make it work with @staticmethod or @ classmethod?