Playing with class decorators

gistfile1.txt

>>> class my_dec(object):
...   def __init__(self, f):
...     self.f = f
... 
>>> class my_dec(object):
...   def __init__(self, f):
...     self.f = f
...   def __call__(self, *args):
...     return self.f(*args)
... 
>>> @my_dec
... def my_func(x,y):
...   return y-x
... 
>>> isinstance(my_func, my_dec)
True
>>>