查看QQ是否在线

源码：

import os,time,datetime,string
import urllib2

def chk_qq(qqnum):
    chkurl = 'http://wpa.qq.com/pa?p=1:'+`qqnum`+':1'
    #print(chkurl)
    a = urllib2.urlopen(chkurl)
    length=a.headers.get("content-length")
    a.close()
    #print length
    print datetime.datetime.now()
    if length=='2329':
        return 'on'
    elif length=='2262':
        return 'off'
    else:
        return 'Unknown Status!'
while True: 
    qq = raw_input("input the QQ num:")
    if ( qq != "q" ):
        qq = string.atoi(qq)
        stat = chk_qq(qq)
        print `qq` + ' is ' + stat + '\n'
    else:
        print "exit!!"
        exit(0)
        

原理是打开网站：http://wpa.qq.com/pa?p=1:qq号:1 根据该网页信息来查看的！