Battery Alarm - run red alert sound if power is unplugged

battery_alarm.py

#download mp3 from http://soundbible.com/81-Red-Alert.html

from time import sleep #load a delay function
from os import system #load the "system" call function
import subprocess #load subprocess module

maybeRunningAlertSound = False #store if we are playing sounds, we are not yet

#Because "True" is always true, this is a good way to run the program forever:
while True is True: 

	#run a system command called acpi and get it's output:
	powerStatus = subprocess.check_output('acpi -a', shell=True)
	
	if 'off-line' in powerStatus: 
		#run red alert mp3 with app called mpg123:
		system('mpg123 /home/luke/bin/Red_Alert_sound.mp3 &')
		maybeRunningAlertSound = True 
		
	else: #we have the power cable plugged in and working
		if maybeRunningAlertSound:#so now we can disable any alerts
			system('killall mpg123') #kill the sound program called mpg123
			maybeRunningAlertSound = False #we know not to run killall again for now
	
	sleep(1) #wait a second before we check again