python检测QQ在线状态脚本

import time,datetime
import urllib2
def chk_qq(qqnum):
chkurl = 'http://wpa.qq.com/pa?p=1:'+`qqnum`+':1'
a = urllib2.urlopen(chkurl)
length=a.headers.get("content-length")
a.close()
print datetime.datetime.now()
if length=='2329':
return 'Online'
elif length=='2262':
return 'Offline'
else:
return 'Unknown Status!'

qq = 77199084
stat = chk_qq(qq)
print `qq` + ' is ' + stat