test_deco.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

def deco(f):

    def f_warpper(*args, **kagrs):
        print 'Hi, I am f_warpper.'
        return f(*args, **kagrs)

    return f_warpper

@deco
def f():
    print 'Hi, I am f.'
    return 1

if __name__ == '__main__':
    print f()