python 装饰器

装饰器:

增加一些额外的功能
# !/usr/bin/env python
# -*- coding: utf-8 -*-
import time
print time.time()
def timer(func):
    def wrapper():
        start_time = time.time()
        func()
        stop_time = time.time()
        print "运行时间:" + str(stop_time - start_time )
    return wrapper
@timer
def i_can_sleep():
    time.sleep(3)

print i_can_sleep()