code: def _seq(self, locus, term, rank, accession):
          
          try:
              feature = self.api.get_feature_by_path(locus,
                                                     term,
                                                     rank,
                                                     accession)
              return feature
          except ApiException as e:
              print("Exception when calling DefaultApi->get_feature_by_path: %s\n" % e)
              return ''
docs: creates GFE from HLA sequence and locus
  
          :param locus: string containing HLA locus.
          :param sequence: string containing sequence data.
  
          :return: GFEobject.