STINNER Victor <victor.stin...@haypocalc.com> added the comment:

> Is it unclear to you what those mean?

Well, it's clear, but I like when I can simply copy/paste the example and it 
does just work:

> If you post a high-quality self-contained example somewhere 
> on the net, I would be happy to link to it.

I just propose to change the example to stop the threads:
------------------
def worker():
    while True:
        item = q.get()
        if item is None:
            break
        do_work(item)
        q.task_done()

q = Queue()
threads = []
for i in range(num_worker_threads):
     t = Thread(target=worker)
     threads.append(t)
     t.start()

for item in source():
    q.put(item)

q.join()       # block until all tasks are done
for i in range(num_worker_threads):
    q.put(None)
for t in threads: t.join()
------------------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12155>
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