How to get a removable disc type in drive

[Gribouillis]

I am not seeing a way to see the disc's type.

I had some success on my linux computer with the command

Output:
udevadm info -q property /dev/cdrom

When a DVD is inserted, the output contains a line

Output:
ID_CDROM_MEDIA_DVD=1

When a CD is inserted, or an audio CD, there is a line

Output:
ID_CDROM_MEDIA_CD=1

When there is nothing in the CD drive, there is no ID_CDROM_MEDIA... line in the output. I don't have a blue ray disk to see what it does.

EDIT: after some tests, I was able to get the information with pyudev

import pyudev


def main():
    context = pyudev.Context()
    a = context.list_devices(sys_name="sr0")
    dev = next(iter(a))
    # print(dev)
    # print(dict(dev.properties))
    if dev.properties.get("ID_CDROM_MEDIA_CD", False):
        print("CD drive contains a CD")
    elif dev.properties.get("ID_CDROM_MEDIA_DVD", False):
        print("CD drive contains a DVD")


if __name__ == "__main__":
    main()

Output:
λ python paillasse/pf/cdrom.py
CD drive contains a DVD

It seems that for blue ray, the property is ID_CDROM_MEDIA_BD