How to use the ltk.constants.CONF_FN function in ltk

# End Python 3
        except KeyboardInterrupt:
            # Python 2
            # logger.info("\nRenit canceled")
            # End Python 2
            # Python 3
            logger.error("\nReinit canceled")
            # End Python 3
            return
        # confirm if deleting existing folder
        if not confirm or confirm in ['n', 'N']:
            return False
        else:
            # delete the corresponding project online
            logger.info('Deleting old project folder and creating new one...')
            config_file_name = os.path.join(project_path, CONF_DIR, CONF_FN)
            if os.path.isfile(config_file_name):
                old_config = ConfigParser()
                old_config.read(config_file_name)
                project_id = old_config.get('main', 'project_id')
                access_token = old_config.get('main', 'access_token')
                api = ApiCalls(host, access_token)
                response = api.delete_project(project_id)
                if response.status_code != 204 and response.status_code != 404:
                    try:
                        error = response.json()['messages'][0]
                        raise exceptions.RequestFailedError(error)
                    except (AttributeError, IndexError):
                        raise exceptions.RequestFailedError("Failed to delete and re-initialize project")
                # delete existing folder
                to_remove = os.path.join(project_path, CONF_DIR)
                shutil.rmtree(to_remove)

def is_initialized(project_path):
    ltk_path = os.path.join(project_path, CONF_DIR)
    if os.path.isdir(ltk_path) and os.path.isfile(os.path.join(ltk_path, CONF_FN)) and \
            os.stat(os.path.join(ltk_path, CONF_FN)).st_size:
        return True
    return False

def _initialize_self(self):
        config_file_name = os.path.join(self.path, CONF_DIR, CONF_FN)
        conf_parser = ConfigParser()
        conf_parser.read(config_file_name)
        self.host = conf_parser.get('main', 'host')
        self.access_token = conf_parser.get('main', 'access_token')
        self.project_id = conf_parser.get('main', 'project_id')
        self.community_id = conf_parser.get('main', 'community_id')
        self.workflow_id = conf_parser.get('main', 'workflow_id')
        self.locale = conf_parser.get('main', 'default_locale')
        self.locale = self.locale.replace('_','-')
        try:
            if conf_parser.has_option('main', 'project_name'):
                self.project_name = conf_parser.get('main', 'project_name')
            if conf_parser.has_option('main', 'download_folder'):
                self.download_dir = conf_parser.get('main', 'download_folder')
            else:
                self.download_dir = None

def init_config_file(self):
		config_file_name = os.path.join(self.path, CONF_DIR, CONF_FN)
		conf_parser = ConfigParser()
		conf_parser.read(config_file_name)
		return config_file_name, conf_parser

def _initialize_self(self):
        config_file_name = os.path.join(self.path, CONF_DIR, CONF_FN)
        conf_parser = ConfigParser()
        conf_parser.read(config_file_name)
        self.host = conf_parser.get('main', 'host')
        self.access_token = conf_parser.get('main', 'access_token')
        self.project_id = conf_parser.get('main', 'project_id')
        self.community_id = conf_parser.get('main', 'community_id')
        self.workflow_id = conf_parser.get('main', 'workflow_id')
        self.locale = conf_parser.get('main', 'default_locale')
        self.locale = self.locale.replace('_','-')
        try:
            if conf_parser.has_option('main', 'project_name'):
                self.project_name = conf_parser.get('main', 'project_name')
            if conf_parser.has_option('main', 'download_folder'):
                self.download_dir = conf_parser.get('main', 'download_folder')
            else:
                self.download_dir = None

def init_config_file(self):
        config_file_name = os.path.join(self.path, CONF_DIR, CONF_FN)
        conf_parser = configparser.ConfigParser()
        conf_parser.read(config_file_name)
        return config_file_name, conf_parser

def is_initialized(project_path):
    ltk_path = os.path.join(project_path, CONF_DIR)
    if os.path.isdir(ltk_path) and os.path.isfile(os.path.join(ltk_path, CONF_FN)) and \
            os.stat(os.path.join(ltk_path, CONF_FN)).st_size:
        return True
    return False