How to timeout user input for turn-based game?

I'm trying to make a basic command-line math game in Python 3. The game shows a user a basic addition problem, the system waits for the user to hit enter, then it displays the answer and then the next problem.

I want to introduce pressure on the player by including a time-out per turn. If the player doesn't hit enter before 3 seconds are up, the game is stopped and a message is displayed.

Problem: How to interrupt the input() after 3 seconds have passed.

Research so far:

• Python multithreading interrupt input()
• https://docs.python.org/3/library/signal.html

Illustrative code snippet:

import signal

import sys


def ask_question():
    input("3 + 4 = ?")


def print_answer():
    print("7")


def timeout_handler(signum, frame):
    print("sorry you ran out of time")
    sys.exit()

MAX_TURN_TIME = 3

ask_question()
signal.signal(signal.SIGALRM, timeout_handler)
signal.alarm(MAX_TURN_TIME)
print_answer()
signal.alarm(0)