Pythonのスレッド完全に理解した

threadtest.py

import threading
import time

def thread1():
    while True:
        time.sleep(1)
        print("Thread1 running")
        if not threading.main_thread().is_alive():
            print("Thread1 exit")
            break

if __name__ == "__main__":
    threading.Thread(target=thread1).start()
    try:
        while True:
            print("Main Thread running")
            time.sleep(0.5)
    except KeyboardInterrupt:
        print("Main Thread exit by Keyboard Interrupt")