python 2.7 检测一个网页是否能正常访问

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


import requests
import sys


url = "https://mp.youkuaiyun.com/"
r = requests.get(url, timeout=5)
code = r.status_code


if code == 200: 
print "OK 网站访问正常"
sys.exit(0)
else:
print "Error 不能访问！"
sys.exit(2)