Read USB through ioreg plist

list_usb.py

import asyncio
import plistlib
from typing import Iterable


def devices_from_bus(bus_entries: Iterable[dict]):
    devices = []
    for bus_entry in bus_entries:
        if 'IORegistryEntryChildren' in bus_entry:
            devices.extend(
                devices_from_bus(bus_entry['IORegistryEntryChildren']))
        else:
            devices.append(bus_entry)
    return devices


async def probe_ioreg():
    process = await asyncio.create_subprocess_exec(
        'ioreg', '-p', 'IOUSB', '-a', '-l',
        stdout=asyncio.subprocess.PIPE)
    ioreg_stdout: bytes = (await process.communicate())[0]
    return plistlib.loads(ioreg_stdout, fmt=plistlib.FMT_XML)


def main():
    loop = asyncio.get_event_loop()
    ioreg = loop.run_until_complete(probe_ioreg())
    devices = devices_from_bus(ioreg['IORegistryEntryChildren'])
    for device in devices:
        if not device['Built-In']:
            print(f"Got device: {device['IORegistryEntryName']}")


if __name__ == '__main__':
    main()