aws-iot-greengrass-for-beginners/alert/main.py [211:246]:
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def exit_sample(msg_or_exception):
    """
    Exit sample with cleaning

    Parameters
    ----------
    msg_or_exception: str or Exception
    """
    global mqtt_connection

    if isinstance(msg_or_exception, Exception):
        logger.error("Exiting sample due to exception.")
        traceback.print_exception(
            msg_or_exception.__class__,
            msg_or_exception,
            sys.exc_info()[2])
    else:
        logger.info("Exiting: %s", msg_or_exception)

    if not mqtt_connection:
        logger.info("Disconnecting...")
        mqtt_connection.disconnect()
    sys.exit(0)


def exit_handler(_signal, frame):
    """
    Exit sample
    """
    exit_sample(" Key abort")


if __name__ == "__main__":
    signal.signal(signal.SIGINT, exit_handler)

    device_main()
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aws-iot-greengrass-for-beginners/sensor/main.py [193:228]:
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def exit_sample(msg_or_exception):
    """
    Exit sample with cleaning

    Parameters
    ----------
    msg_or_exception: str or Exception
    """
    global mqtt_connection

    if isinstance(msg_or_exception, Exception):
        logger.error("Exiting sample due to exception.")
        traceback.print_exception(
            msg_or_exception.__class__,
            msg_or_exception,
            sys.exc_info()[2])
    else:
        logger.info("Exiting: %s", msg_or_exception)

    if not mqtt_connection:
        logger.info("Disconnecting...")
        mqtt_connection.disconnect()
    sys.exit(0)


def exit_handler(_signal, frame):
    """
    Exit sample
    """
    exit_sample(" Key abort")


if __name__ == "__main__":
    signal.signal(signal.SIGINT, exit_handler)

    device_main()
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