new_contents: #this is the python script to run, 
  #it captures serial data from the arduino (requires pyserial)
  #then it plays an mp3 (requires pygame)
  
  import serial
  import pygame as pg
  
  ser = serial.Serial(PORT NUMBER, 57600)
  
  pg.init()
  pg.mixer.music.load("sound.mp3")
  
  while True:
  	#run this loop ad infinitum
  
  	#read a line
  	line = ser.readline()
  	#make sure that there are no errors, convert the serial to ints
  	try:
  		line = int(line)
  	except (RuntimeError, TypeError, NameError, ValueError):
  		pass
  
  	print line
  	if line == 2:
  	# this means that the button has just been pushed, start playing the music
  		print "Play that music!"
  		pg.mixer.music.play()
  	elif line ==3:
  	#the button is still pushed in, keep that song going
  		pass
  	else:
  	#the button is not pushed, stop the music
  		pg.mixer.music.stop()
  
subject: Create whoop.py