类装饰器在Python2.7中没有按预期工作

def supress_help(cls, a, b):
    def wrapper(func):
        def wrappy(*arg, **kwargs):
            if arg[1] < 5:
                func(arg[1])
            else:
                print("Not calling the helper")
        return wrappy

    cls.help = wrapper(cls.help)
    print(a + b)
    return cls

@supress_help(a=7, b="Hello")
class Helper(object):

    def help(x):
        print(x)

if __name__ == "__main__":
    obj = Helper()
    obj.help(2)
    obj.help(7)



Traceback (most recent call last):
  File "/home/aditya/class_decorator.py", line 14, in <module>
    @supress_help(a=7, b="Hello")
TypeError: supress_help() takes at least 1 argument (2 given)