查看QQ是否在线

源码：

import os,time,datetime,stringimport urllib2def 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！