How to use the qualysapi.settings.default_filename function in qualysapi

def connect(config_file=qcs.default_filename, remember_me=False, remember_me_always=False):
    """ Return a QGAPIConnect object for v1 API pulling settings from config
    file.
    """
    # Retrieve login credentials.
    conf = qcconf.QualysConnectConfig(filename=config_file, remember_me=remember_me, 
                                      remember_me_always=remember_me_always)
    connect = qcconn.QGConnector(conf.get_auth(),
                                 conf.get_hostname(),
                                 conf.proxies,
                                 conf.max_retries)
    logger.info("Finished building connector.")
    return connect

    def __init__(self, filename=qcs.default_filename, remember_me=False, remember_me_always=False):

        self._cfgfile = None

        # Prioritize local directory filename.
        # Check for file existence.
        if os.path.exists(filename):
            self._cfgfile = filename
        elif os.path.exists(os.path.join(os.path.expanduser("~"), filename)):
            # Set home path for file.
            self._cfgfile = os.path.join(os.path.expanduser("~"), filename)

        # create ConfigParser to combine defaults and input from config file.
        self._cfgparse = ConfigParser(qcs.defaults)

        if self._cfgfile:
            self._cfgfile = os.path.realpath(self._cfgfile)