Python-сообщество

 UA = 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/48.0'
    with requests.Session() as s:
        s.headers['User-Agent'] = UA
        r = s.get('https://vk.com/login')
        remixlhk = r.cookies._cookies['.vk.com']['/']['remixlhk'].value
        tree = html.fromstring(r.content)
        ip_h = tree.xpath("//form[@id='login_form']/input[@name='ip_h']")[0].value
        lg_h = tree.xpath("//form[@id='login_form']/input[@name='lg_h']")[0].value
        data_set = {
            'act': 'login',
            'role': 'al_frame',
            'expire': '',
            'captcha_sid': '',
            'captcha_key': '',
            '_origin': 'https://vk.com',
            'ip_h': ip_h,
            'lg_h': lg_h,
            'email': login,
            'pass': password,
        }
        prepared_post = requests.Request('POST', "https://login.vk.com/?act=login",
                                         data=data_set,
                                         headers={
                                             'User-Agent': UA,
                                             'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
                                             'Cookie': 'remixlhk=%s; remixlang=3; remixflash=0.0.0; remixscreen_depth=24; remixdt=0' % remixlhk,
                                             'Referer': 'https://vk.com/login',
                                             'Host': 'login.vk.com',
                                             'Accept-Encoding': 'gzip, deflate, br',
                                             'Accept-Language': 'en-US,en;q=0.5',
                                             'Connection': 'keep-alive',
                                             'Upgrade-Insecure-Requests': '1'
                                         })
        prepared_post = prepared_post.prepare()
        del prepared_post.headers['Content-Length']
        del prepared_post.headers['Content-Type']
        response = s.send(prepared_post, allow_redirects=False)
        # post = s.post("https://login.vk.com/?act=login", data=data_set)
        # val_cookies = post.cookies
        print response.headers
        assert 'remixq_' in response.headers.get('Set-Cookie')
        res = s.get('https://vk.com/kaldown')
        print 'Страница доступна только авторизованным пользователям' not in res.content