How to change the sound volume with python ?

[Lightningwalrus]

Hello, I'm new here !

My hobby is microcontrollers and now I'm doing a project where I could change the sound volume with buttons on my breadboard. I tried a program which can open a website by pushing a button on the breadboard which I took from the book that I read.


Here is that program from the book called "Make: AVR programming" by Elliot Williams

## Simple demo
## Sits forever listening to serial port
## When you press button, opens website of your choosing.
## Extend this to many buttons and you'll have a physical
##  web-launcher.  

BOSS_SITE = "http://animal-dream.com/data_images/badger/badger1.jpg"
## or perhaps more topical...
XKCD = "http://xkcd.com/353/"

SERIAL_PORT = "COM5"
BAUD_RATE = 9600

import serial
import webbrowser

sp = serial.Serial(SERIAL_PORT, BAUD_RATE, timeout = 5)
sp.flush()
print ("Boss Button")

while(1):                       # Sit and wait forever
    response = sp.read(1)       # get one byte
    if response == "O":
        print "Got OK Byte.  Waiting for button press."
    elif response == "X":
        print "Got Boss Byte!  Alarm!"
        webbrowser.open(BOSS_SITE)
    else:
        print "Got nothing.  Still waiting."

How do I change this code so I can change the sound volume on my computer ? I use windows 7.