Python 3 version of Null 2 systembuttons.py

systembuttons.py

#!/usr/bin/python3
# Shutdown and volume control

import keyboard
import time
import os

INITIAL_VOLUME = "25%"

def shutdown():
    os.system("sudo shutdown -h now")

def volumeUp():
    os.system("amixer sset -q 'Master' 5%+")

def volumeDown():
    os.system("amixer sset -q 'Master' 5%-")

# Initialize volume at INITIAL_VOLUME.
os.system("amixer sset -q 'Master' " + INITIAL_VOLUME)

keyboard.add_hotkey('y+s', callback=volumeUp)
keyboard.add_hotkey('y+a', callback=volumeDown)
keyboard.add_hotkey('y+left alt', callback=shutdown)

keyboard.wait()