work_thread_test.py

import time
from threading import Thread


stopped = False


def work():
    i = 0
    while not stopped:
        i += 1
        print(f"Работаю {i}")
        time.sleep(0.25)
    print("Работа остановлена")

print("Нажмите Enter для остановки работы")

work_thread = Thread(target=work)
work_thread.start()

try:
    input()
finally:
    stopped = True
    work_thread.join()