[docs] [issue12155] queue example doesn't stop worker threads

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The proposed change adds about 7 lines to show the 'trick' of putting num-worker Nones on the queue. I think that is worth it.

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nosy: +terry.reedy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12155>
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