import http


def get_not_found_error(id_field, entity_id):
    """Returns an error message and HTTP status code for a NOT FOUND error.

    Args:
        id_field: Name of the ID field whose value does not exist, as a string.
        entity_id: ID that does not exist, as a string.

    Returns:
        See module docstring.
    """
    return f'{id_field} {entity_id} not found', http.HTTPStatus.NOT_FOUND