simplify

            action = soup_login.find('form', id='fm1')['action']  # get login url

            logging.debug('action= ' + action)

            lt = soup_login.find('input', attrs={'name': 'lt'})['value']  # Get parameter "lt"

            logging.debug('lt= ' + lt)

            execution = soup_login.find('input', attrs={'name': 'execution'})['value']  # Get parameter "execution"

            logging.debug('execution= ' + execution)

            info = {}

            for element in soup_login.find('form').find_all('input'):

                if element.has_attr('value'):

                    info[element['name']] = element['value']

            info['username'] = config['username']

            info['password'] = config['password']

            logging.debug(info)

            logging.info('Login information acquired.')

            url = 'http://weblogin.sustc.edu.cn{}'.format(action)

            data = 'username={}&password={}&lt={}&execution={}&_eventId=submit&submit=LOGIN'. \

                format(config['username'], config['password'], lt, execution)

            h = {'Host': 'weblogin.sustc.edu.cn', 'Connection': 'keep-alive', 'Cache-Control': 'max-age=0',

                 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',

                 'Origin': 'http://weblogin.sustc.edu.cn', 'Upgrade-Insecure-Requests': '1',

            logging.info('Login as ' + config['username'])

            r = login.post(url, data=data, headers=h)

            r = login.post(url, data=info, headers=h)

            logging.info('Login information posted to the CAS server.')

            soup_response = BeautifulSoup(r.content, 'html5lib')