Windows Audio Sleep Timer

windowsSleepTimer.py

# This script mutes your windows audio after a certain amount of entered time
# Requires PyCaw (>pip install pycaw)
# Usage:
# > python sleepTimer.py <minutes until silence>

import sys

if(len(sys.argv)<2):
	exit("Error. No countdown time provided")

if(sys.argv[1]=="-h" or
	sys.argv[1]=="--help"):
	exit(
"""
Usage: 
> python sleepTimer.py <minutes until silence>

Example: 
> python sleepTimer.py 60

You can use decimals too. 
For a 1.5 minute countdown:
> python sleepTimer.py 1.5
"""
	)
# turn off volume after input time
sleepTime = int(round(float(sys.argv[1]) * 60))

from threading import Timer
from ctypes import cast, POINTER
from comtypes import CLSCTX_ALL
from pycaw.pycaw import AudioUtilities, IAudioEndpointVolume
import math

# Get default audio device using PyCAW
devices = AudioUtilities.GetSpeakers()
interface = devices.Activate(
    IAudioEndpointVolume._iid_, CLSCTX_ALL, None)
volume = cast(interface, POINTER(IAudioEndpointVolume))

def turnDownAudio():
	global sleepTime
	sleepTime -= 1
	if sleepTime>0:
		print(sleepTime)
		Timer(1,turnDownAudio).start()
	else:
		volume.SetMasterVolumeLevelScalar(0, None)
		print("volume turned down")

turnDownAudio()

Thanks