In Python threading, how I can I track a thread's completion?

Question

I\'ve a python program that spawns a number of threads. These threads last anywhere between 2 seconds to 30 seconds. In the main thread I want to track whenever each thread

Answer 1

I use a slightly different technique because of the nature of the threads I used in my application. To illustrate, this is a fragment of a test-strap program I wrote to scaffold a barrier class for my threading class:

   while threads:
        finished = set(threads) - set(threading.enumerate())
        while finished:
            ttt = finished.pop()
            threads.remove(ttt)
        time.sleep(0.5)

Why do I do it this way? In my production code, I have a time limit, so the first line actually reads "while threads and time.time() < cutoff_time". If I reach the cut-off, I then have code to tell the threads to shut down.