import urllib

 import urllib2

 import cookielib

 login_url = "xxxxxxxxxxxxx"

 cj = cookielib.CookieJar()#实例化对象，创建cookie容器cj

 opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))#通过build_opener方法构造一个包含把cookie传给HTTP...构造方法的类实例的ＵＲＬ访问器

10 contens = opener.open(login_url).read()#这里是因为学校官网提交的表单中需要有一个lt参数，而它是变化的所以先获取解析一下得到它

 lt = re.findall('<input type="hidden" name="lt" value="(.*)" />',contents1)

 
   #payload

 form_info={"username":"xx","password":"xx","lt":lt[0],"_eventId":"submit","errors":""}

 postData = urllib.urlencode(form_info)

 opener.addheaders=[("User-Agent","xxxx"),]#我是浏览器

 resp = opener.open(login_url,postData)

 print resp.read()