[docs] [issue15034] Document best practices for exceptions

[Ezio Melotti]

Ezio Melotti added the comment:

I'm removing the "devguide" component and update the title accordingly.

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components: +Documentation -Devguide
title: Devguide should document best practices for stdlib exceptions -> Document best practices for exceptions

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15034>
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