KbdBacklight Toggle

#! /usr/bin/python
# Python script to turn on or off the brightness in Macbooks on Linux or Chromium OS. It can require sudo password.
# Autor: Vinícius de Ávila Jorge (vinicius.avila.jorge@gmail.com)

import time
import subprocess
import os

limiar = 20

def toggle_on():
    os.system("sudo bash -c 'echo 64 > /sys/devices/platform/applesmc.768/leds/smc\:\:kbd_backlight/brightness'")

def toggle_off():
    os.system("sudo bash -c 'echo 0 > /sys/devices/platform/applesmc.768/leds/smc\:\:kbd_backlight/brightness'")

def check_brightness():
    out = subprocess.check_output(["cat", "/sys/devices/platform/applesmc.768/light"])
    out = int(out[1: -4])
    if out < limiar: return True
    else: return False

if check_brightness(): toggle_on()
else: toggle_off()