How to use the bugwarrior.config.load_config function in bugwarrior

def _try_load_config(main_section, interactive=False):
    try:
        return load_config(main_section, interactive)
    except IOError:
        # Our standard logging configuration depends on the bugwarrior
        # configuration file which just failed to load.
        logging.basicConfig()

        exc_info = sys.exc_info()
        log.critical("Could not load configuration. "
                     "Maybe you have not created a configuration file.",
                     exc_info=(exc_info[0], exc_info[1], None))
        sys.exit(1)

def targets():
    config = load_config('general')
    for section in config.sections():
        if section in ['general', 'notifications'] or \
           section.startswith('flavor.'):
            continue
        service_name = config.get(section, 'service')
        service_class = get_service(service_name)
        for option in config.options(section):
            value = config.get(section, option)
            if not value:
                continue
            if '@oracle:use_keyring' in value:
                service_config = ServiceConfig(
                    service_class.CONFIG_PREFIX, config, section)
                yield service_class.get_keyring_service(service_config)