Set logging level of this module. Using
    `logbook <https://logbook.readthedocs.io/en/stable/>`__ module for logging.

    :param int log_level:
        One of the log level of
        `logbook <https://logbook.readthedocs.io/en/stable/api/base.html>`__.
        Disabled logging if ``log_level`` is ``logbook.NOTSET``.
    :raises LookupError: If ``log_level`` is an invalid value.

def set_log_level(log_level):
    """
    Set logging level of this module. Using
    `logbook <https://logbook.readthedocs.io/en/stable/>`__ module for logging.

    :param int log_level:
        One of the log level of
        `logbook <https://logbook.readthedocs.io/en/stable/api/base.html>`__.
        Disabled logging if ``log_level`` is ``logbook.NOTSET``.
    :raises LookupError: If ``log_level`` is an invalid value.
    """

    if not LOGBOOK_INSTALLED:
        return

    # validate log level
    logbook.get_level_name(log_level)

    if log_level == logbook.NOTSET:
        set_logger(is_enable=False)
    else:
        set_logger(is_enable=True)

    logger.level = log_level