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cj = http.cookiejar.CookieJar()

pro = urllib.request.HTTPCookieProcessor(cj)

opener = urllib.request.build_opener(pro)

urllib.request.install_opener(opener)

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import requests

from bs4 import BeautifulSoup

url = "http://www.v2ex.com/signin"

UA = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.13 Safari/537.36"

header = { "User-Agent" : UA,

           "Referer": "http://www.v2ex.com/signin"

           }

v2ex_session = requests.Session()

f = v2ex_session.get(url,headers=header)

soup = BeautifulSoup(f.content,"html.parser")

once = soup.find('input',{'name':'once'})['value']

print(once)

postData = { 'u': 'whatbeg',

             'p': '*****',

             'once': once,

             'next': '/'

             }

v2ex_session.post(url,

                  data = postData,

                  headers = header)

f = v2ex_session.get('http://www.v2ex.com/settings',headers=header)

print(f.content.decode())