python登录豆瓣并发帖的方法

# -- coding:gbk --
import sys, time, os, re
import urllib, urllib2, cookielib
loginurl = 'https://www.douban.com/accounts/login'
cookie = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookie))
params = {
"form_email":"your email",
"form_password":"your password",
"source":"index_nav" #没有的话登录不成功
}
#从首页提交登录
response=opener.open(loginurl, urllib.urlencode(params))
#验证成功跳转至登录页
if response.geturl() == "https://www.douban.com/accounts/login":
  html=response.read()
  #验证码图片地址
  imgurl=re.search('<img id="captcha_image" src="(.+?)" alt="captcha" class="captcha_image"/>', html)
  if imgurl:
    url=imgurl.group(1)
    #将图片保存至同目录下
    res=urllib.urlretrieve(url, 'v.jpg')
    #获取captcha-id参数
    captcha=re.search('<input type="hidden" name="captcha-id" value="(.+?)"/>' ,html)
    if captcha:
      vcode=raw_input('请输入图片上的验证码：')
      params["captcha-solution"] = vcode
      params["captcha-id"] = captcha.group(1)
      params["user_login"] = "登录"
      #提交验证码验证
      response=opener.open(loginurl, urllib.urlencode(params))
      ''' 登录成功跳转至首页 '''
      if response.geturl() == "http://www.douban.com/":
        print 'login success ! '
        print '准备进行发帖'
        p={"ck":""}
        c = [c.value for c in list(cookie) if c.name == 'ck']
        if len(c) > 0:
          p["ck"] = c[0].strip('"')    
        addtopicurl="http://www.douban.com/group/python/new_topic"
        res=opener.open(addtopicurl)
        html=res.read()
        m= re.search('<input type="hidden" name="topic_id" value="(.+?)">', html) 
        p["topic_id"] = m.group(1)
        m= re.search('<input type="hidden" name="topic_id_sig" value="(.+?)">', html) 
        p["topic_id_sig"] = m.group(1)
        p["rev_title"] = 'title'
        p["rev_text"] = 'send body'
        p["rev_submit"] = '好了，发言'
        request=urllib2.Request(addtopicurl)
        request.add_header("User-Agent","Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11")
        request.add_header("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3")
        request.add_header("Origin", "http://www.douban.com")
        request.add_header("Referer", "http://www.douban.com/group/python/new_topic")
        opener.open(request, urllib.urlencode(p))