def export_type_display(self):
        if self._export_type == EXPORT_TYPE_GRADEBOOK:
            return 'GRADEBOOK'
        elif self._export_type == EXPORT_TYPE_CLICKSTREAM:
            return 'CLICKSTREAM'
        elif self._export_type == EXPORT_TYPE_TABLES:
            return 'TABLES'
        else:
            return self._export_type