code: def _delete_record(self, identifier=None, rtype=None, name=None,
                         content=None):
          
          record_ids = []
          if not identifier:
              records = self._list_records(rtype, name, content)
              record_ids = [record['id'] for record in records]
          else:
              record_ids.append(identifier)
  
          for record_id in record_ids:
              opts = {'id': record_id}
              opts.update(self._auth)
              response = self._api.nameserver.deleteRecord(opts)
              self._validate_response(
                  response=response, message='Failed to update record')
  
          return True
docs: delete a record
          filter selection to delete by identifier or rtype/name/content
  
          :param int identifier: identifier of record to update
          :param str rtype: rtype of record
          :param str name: name of record
          :param mixed content: value of record
          :return bool: success status
          :raises Exception: on error