gistfile1.py

>>> def greets(function):
...   def greets_wrapper(*args, **kwargs):
...     print "hi there, ", function
...     return function(*args, **kwargs)
...   return greets_wrapper
... 
>>> @greets
... def add(num1, num2):
...   return num1 + num2
... 
>>> add(1, 2)
hi there,  <function add at 0x109da2aa0>
3