main.py

import serial                                      
import pyautogui                                   
Arduino_Serial = serial.Serial('com12',9600)       
 
while 1:
    incoming_data = str (Arduino_Serial.readline()) 
    print incoming_data                           
     

    if 'next' in incoming_data:                    
        pyautogui.hotkey('ctrl', 'pgdn')          
        
    if 'previous' in incoming_data:                
        pyautogui.hotkey('ctrl', 'pgup')           

    if 'down' in incoming_data:                    
        #pyautogui.press('down')                   
        pyautogui.scroll(-100) 
         
    if 'up' in incoming_data:                      
        #pyautogui.press('up')                      
        pyautogui.scroll(100)
        
    if 'change' in incoming_data:                  
        pyautogui.keyDown('alt')                   
        pyautogui.press('tab')
        pyautogui.keyUp('alt')
        
    incoming_data = "";