volume.py

#!/usr/bin/python3

# pip3 install pyalsaaudio
# not for windows
import platform
if platform.uname()[0] == 'Windows':
    exit()
	
try:
	import alsaaudio
except ImportError:
	exit()

import sys

m = alsaaudio.Mixer()
vol = m.getvolume()

def getVolume():
	global vol
	return vol[0]

def increase(n):
	global vol
	if (vol[0] + n)>100:
		vol[0]= 100 - n
	m.setvolume(vol[0] + n)
	vol = m.getvolume()
	print("Volume increased to " + str(vol[0]) + " percent")

def decrease(n):
	global vol
	if (vol[0] - n)>100:
		vol[0]= 100 + n
	m.setvolume(vol[0] - n)
	vol = m.getvolume()
	print("Volume decreased to " + str(vol[0]) + " percent")

def setVolume(n):
	global vol
	m.setvolume(n)
	vol = m.getvolume()	
	print ("Volume set to " + str(vol[0]) + " percent")

if len(sys.argv) == 1 or sys.argv[1] == "g":
	print("Current volume is " + str(getVolume()) + " percent")

if len(sys.argv)>=3:
	if sys.argv[1] == "i":
		try:
			i = int(sys.argv[2])
			increase(i)
		except ValueError:
			print("Please specify a number after saying increase volume by")

	elif sys.argv[1] == "d":
		try:
			d = int(sys.argv[2])
			decrease(d)
		except:
			print("Please specify a number after saying decrease volume by")

	elif sys.argv[1] == "s":
		try:
			s = int(sys.argv[2])
			setVolume(s)
		except:
			print ("Please specify a number after saying set volume to")