Python can't find pyautogui

[Taneb2]

I can't manage to make it work the code I've written this : import pyautogui as pg import time import webbrowser as web parsedMessage="Puto" web.open('https://web.whatsapp.com/'+'+#########'+parsedMessage) time.sleep(1) for i in range(10000000): pg.write('Sondrio') pg.press('enter') print('Mensaje #'+str(i+1)+' enviado') pass pg.alert('Spam terminado.')

and it pops up this eror: ModuleNotFoundError: No module named 'pyautogui'