Getting friendly device names in python

Question

I have a 2-port signal relay connected to my computer via a USB serial interface. Using the pyserial module I can control these relays with ease. However, this is based on the assumption that I know beforehand which COM-port (or /dev-node) the device is assigned to.

For the project I'm doing that's not enough since I don't want to assume that the device always gets assigned to for example COM7 in Windows. I need to be able to identify the device programatically across the possible platforms using python.

Can anyone suggest me anything?

Answer 1

Regarding Linux, if all you need is to enumerate devices, you can even skip pyudev dependency for your project, and simply parse the output of /sbin/udevadm info --export-db command. It will dump all information about present devices and classes, including USB product IDs for USB devices, which should be more then enough to identify your USB-to-serial adapters. Of course, you can also do this with pyudev.