import snoop

class Test:
    # TypeError: compile() arg 1 must be a string, bytes or AST object
    @snoop
    @classmethod
    def class_test(cls):
        pass

import snoop

class Test:
    @classmethod
    @snoop
    def class_test(cls):
        pass

Test.class_test = classmethod(snoop(Test.class_test.__func__))