threading.enumerate

threading.enumerateで生存中のThreadオブジェクト全てのリストを取得できます。

import logging
import threading
import time

logging.basicConfig(level=logging.DEBUG, format='%(threadName)s: %(message)s')


def worker1():
    logging.debug('start')
    time.sleep(5)
    logging.debug('end')

if __name__ == '__main__':
    #threads = []
    for _ in range(5):
        t = threading.Thread(target=worker1)
        t.setDaemon(True)
        t.start()
        #threads.append(t)

    for thread in threading.enumerate():
        if thread is threading.currentThread():
            print(thread)
            continue
        thread.join()

Thread-1: start
Thread-2: start
Thread-3: start
Thread-4: start
Thread-5: start
<_MainThread(MainThread, started 4599717312)>
Thread-1: end
Thread-2: end
Thread-5: end
Thread-4: end
Thread-3: end