How to use the catalogue.pycswsettings.build_pycsw_settings function in catalogue

def get(self, request,app=None):
        pycsw_settings = build_pycsw_settings(app)
        server = Csw(rtconfig=pycsw_settings, env=request.META.copy())
        if not app:
            app = "all"
        #request by named app, use app related view
        record_table = Application.get_view_name(app)
        try:
            if not self.application_records.get(app,None):
                base = declarative_base(bind=server.repository.engine,mapper=Mapper)
                self.application_records[app] = type('dataset', (base,),
                        dict(__tablename__=record_table,__table_args__={'autoload': True,'schema': None},__mapper_args__={"primary_key":["id"]}))
            server.repository.dataset = self.application_records[app]
        except:
            pass

        server.request = "http://{}{}".format(get_current_site(request),
                                              reverse("csw_endpoint"))

def handle(self, *args, **options):
        log_level = {
            0: logging.ERROR,
            1: logging.WARNING,
            2: logging.INFO,
            3: logging.DEBUG
        }.get(options["verbosity"])
        logger.setLevel(log_level)
        pycsw_logger = logging.getLogger("pycsw")
        pycsw_logger.setLevel(log_level)
        pycsw_config = build_pycsw_settings()
        context = StaticContext()
        self.pycsw_admin_handler.parse_configuration(pycsw_config, context)
        ArgsObject = namedtuple("ArgsObject", options.keys())
        the_args = ArgsObject(**options)
        result = the_args.func(the_args)
        if result is not None:
            self.stdout.write(result)
        self.stdout.write("Done!")

def post(self, request,app=None):
        pycsw_settings = build_pycsw_settings()
        server = Csw(rtconfig=pycsw_settings, env=request.META.copy(),
                     version=self._get_post_version(request.body))
        logger.info(request.body)
        server.request = request.body
        server.requesttype = request.method
        status_code, response = server.dispatch()
        return HttpResponse(response, status=status_code,
                            content_type="application/xml")