demo of decorator in python

decorator.py

"""
Created on 2013-4-8
@author: xiaoke.zhangxk
"""


def blue_box(func):
    def wrapped():
        print "~~ blue ~~~"
        func()
        print "~~ blue ~~"
    return wrapped


def red_box(func):
    def wrapped():
        print "** red **"
        func()
        print "** red **"
    return wrapped


def box():
    print " i am a box."
    
box()

print "-----------------"
decorated = red_box(blue_box(box))
decorated()
print "-----------------"

@blue_box
@red_box
def new_box():
    print "i am another box."

new_box()