Vilnis Termanis <vilnis.terma...@googlemail.com> added the comment:

I couldn't see the wood for the trees:
If put() is thread-blocking, multiprocessing.Queue is reduced to the same 
functionality as multiprocessing.queues.SimpleQueue, if I'm not mistaken. So 
maybe there should be a warning in the documentation that, for 
multiprocessing.[Joinable]Queue, modifying obj straight after calling put(obj) 
might en-queue the modified version.

To me at least this wasn't obvious until I looked at the multiprocessing.queue 
code.

I've modified the example for clarity and retracted the (unworthy) patch 
attempt.

Regards,
VT

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<http://bugs.python.org/issue8037>
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