Oh, thank you. It works perfectly with try/except! Also I have one more question. I need to make value bigger (multiply), but this does not work. How can I do it?
from pynput.mouse import Button, Controller import time import serial mouse = Controller() ser = serial.Serial('COM3', baudrate=9600, timeout=1) while True: try: arduinoData = ser.readline().decode('ascii') data = (arduinoData)/5 print(data) mouse.position = (data, 100) except: print("fail") breakEDIT: Solved also this.