flash keyboard lights

crazycapslock.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import time
import os
import sys
import glob

if os.name != "posix":
    print("ERROR: Linux only!")
    sys.exit(1)
if os.geteuid() != 0:
    print("ERROR: Run this as root!")
    sys.exit(1)

files = glob.glob("/sys/class/leds/*lock")
print("LEDs found:")
for i, led in enumerate(files):
    print(f" - {i}: {os.path.basename(led)}")
file = open(os.path.join(files[int(input("Your choice: ").strip())], "brightness"), "w")
x = False
delay = float(input("Delay: ").strip())
try:
    while True:
        file.write("1" if x else "0")
        file.flush()
        time.sleep(delay)
        x = not x
except KeyboardInterrupt:
    print("Exiting...")
    file.close()