KeyHook

from pynput import keyboard
import time
import os

def on_press(key):
    try: k = key.char # single-char keys
    except: k = key.name # other keys
    if key == keyboard.Key.esc: return False # stop listener
    if k in ['3']: # keys interested
        os.system("taskkill /f /pid "+str(os.getpid()))
        return False # remove this if want more keys

lis = keyboard.Listener(on_press=on_press)
lis.start() # start to listen on a separate thread

while True:
	time.sleep(1)