Some example code for controlling keyboard backlight on Dell laptops via sysfs and pathlib

dell_keyboard_backlight.py

#!/usr/bin/env python3

from pathlib import Path
import time

sysfs_path = Path('/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight/brightness')
for i in range(4):
    print(i)
    time.sleep(1)
    # write 0 to turn off backlight
    # write 3 to turn it up to max
    sysfs_path.write_text(str(i))