请问 Python 多线程该如何终止程序？

下面是代码结构，我的问题是ctrl+c无法终止程序，请老哥们看下有什么办法，搜了很多比如 signal，try 等方法都不适用

import time
import threading


class Task(threading.Thread):
    def __init__(self, *args, **kwargs):
        super(Task, self).__init__(*args, **kwargs)
        self.daemon = True

    def task1(self):
        while True:
            print("starting task1")
            time.sleep(5)
            print("task1 completed!")

    def task2(self):
        while True:
            print("starting task2")
            time.sleep(15)
            print("task2 completed!")

    def run(self):
        try:
            thread1 = threading.Thread(target=self.task1)
            thread2 = threading.Thread(target=self.task2)
            thread1.start()
            thread2.start()
            thread1.join()
            thread2.join()
        except KeyboardInterrupt:
            print("KeyboardInterrupt has been caught.")
        

if __name__ == "__main__":
    task = Task()
    task.run()