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I solved my problem by using a function that times out if no key is pressed. It was really hard to find how to make this, so here it is if someone needs it.

def getch(timeout=0.1):
    """Returns single character of raw input or timesout"""
    class TimeoutException (Exception):
        pass

    def signalHandler (signum, frame):
        raise TimeoutException ()


    def _getch():
        global key
        try:
            fd = sys.stdin.fileno()
            old_settings = termios.tcgetattr(fd)
            try:
                tty.setraw(sys.stdin.fileno())
                select.select([sys.stdin], [], [], 0)
                key = sys.stdin.read(1)
            finally:
                termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
                return key
        except TimeoutException:
            print("Timed out")
            return key
    signal.signal(signal.SIGALRM, signalHandler)
    signal.setitimer(signal.ITIMER_REAL, timeout)
    try:
        result = _getch()
    finally:
       signal.alarm(0)
    return result