[docs] [issue15339] document the threading "facts of life" in Python

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Given the scope of the issue, a concurrent programming howto that lists some of the available options and the caveats associated with each of them seems worthwhile.

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nosy: +ncoghlan

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15339>
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