python 2.7 检测一个网页是否能正常访问的方法

#!/bin/env python#coding:utf-8import requestsimport sysurl = "https://mp.csdn.net/"r = requests.get(url, timeout=5)code = r.status_codeif code == 200: 	print "OK 网站访问正常"	sys.exit(0)else:	print "Error 不能访问！"	sys.exit(2)