class object def __init__ self func self func func self __name__ func

class A(object):
    def __init__(self, func):
        self.func = func
        self.__name__ = func.__name__

    def __call__(self, *args, **kwargs):
        return self.func(*args, **kwargs)

class B(object):
    def a(self):
        return self.b(0)

    @A
    def b(self, c):
        return c

print B().a()


[mag@frontier:~]% python b.py
Traceback (most recent call last):
  File "b.py", line 17, in <module>
    print B().a()
  File "b.py", line 11, in a
    return self.b(0)
  File "b.py", line 7, in __call__
    return self.func(*args, **kwargs)
TypeError: b() takes exactly 2 arguments (1 given)
[mag@frontier:~]1%