filename = os.path.join(os.path.dirname(__file__), 'config.txt')
    with open(filename, 'a+') as f:
        config = configparser.ConfigParser(defaults={'username': '', 'password': ''})
        f.seek(0)
        config.read_file(f)
        username = config.get(configparser.DEFAULTSECT, 'username')
        password = config.get(configparser.DEFAULTSECT, 'password')
        username = input('username (leave blank to use \'{}\'): '.format(username)) or username
        password = input('password : ') or password
        print(username)
        config.set(configparser.DEFAULTSECT, 'username', username)
        config.set(configparser.DEFAULTSECT, 'password', password)
        config.write(f)