Python: How to subclass threading.Thread

demo.py

import random
import threading
import time


class MyThread(threading.Thread):
    def run(self):
        seconds = random.random()
        print(f"sleeping for {seconds} seconds")
        time.sleep(seconds)
        print(f"waking")


if __name__ == "__main__":
    for i in range(3):
        t = MyThread()
        t.start()