interrupt_infinite_loop.py

import time
import threading


input_thread_values = []


def input_thread():
    print('press s and enter to stop...')
    global input_thread_values
    input_thread_values.append(input())
    print('input_thread has got: {}'.format(input_thread_values))


def do_stuff():
    t = threading.Thread(target=input_thread)
    t.daemon = True  # thread dies when main thread (only non-daemon thread) exits.
    t.start()
    global input_thread_values
    while not input_thread_values:
        print('sleeping')
        time.sleep(1)

    print('interrupted: {}'.format(input_thread_values))


do_stuff()