import urllib, urllib2, cookielib 
from BeautifulSoup import BeautifulSoup

def login():
    cj = cookielib.CookieJar()
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
    opener.addheaders = [('User-Agent', 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.11) Gecko/20101012 Firefox/3.6.11'), ]
    urllib2.install_opener(self.opener)

    url = urllib2.urlopen('https://........./')
    doc = BeautifulSoup(url.read())
    csrf_input = doc.find(attrs={'name':'csrfmiddlewaretoken'})
    csrf_token = csrf_input['value']

    params = urllib.urlencode({
        'username': 'мой логин',
        'password': 'мой пароль',
        'csrfmiddlewaretoken': csrf_token,
    })
    req = urllib2.Request('https://.........../', data=params, headers={'Referer': 'https://......../'})
    url = urllib2.urlopen(req)
    print url.read()
 
    doc = BeautifulSoup(url.read(), fromEncoding="utf-8")
    errors = doc.findAll('ul', attrs={'class':"errorlist"})
    if errors:
        raise LoginException('; '.join([error.contents[0].text for error in errors]))

    return urllib2