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# coding=utf-8  
import requests  
from bs4 import BeautifulSoup as bs  
   
s = requests.Session()  
headers = {  
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64)\
     AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36',  
    'Origin': 'http://www.v2ex.com',  
    'Referer': 'http://www.v2ex.com/signin',  
    'Host': 'www.v2ex.com',  
}  
r = s.get('http://www.v2ex.com/signin', headers=headers) 
soup = bs(r.content)  
once = soup.find('input', {'name': 'once'})['value']   
login_data = {'u': 'sijianwudi', 'p': '111111', 'once': once, 'next': '/'}  
   
s.post('http://www.v2ex.com/signin', login_data, headers=headers)  
   
f = s.get('http://www.v2ex.com/settings', headers=headers)  
soup = bs(f.content) 
print soup.find('input', {'type':'email'})['value']