[issue2230] Document PyArg_Parse* behavior on failed conversion

[Alexander Belopolsky]

New submission from Alexander Belopolsky:

Much of existing code relies on PyArg_Parse* leaving C variables 
unmodified when conversion failed.  Attached patch documents that 
behavior.

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files: doc-arg.diff
keywords: patch
messages: 63243
nosy: belopolsky
severity: normal
status: open
title: Document PyArg_Parse* behavior on failed conversion
Added file: http://bugs.python.org/file9598/doc-arg.diff

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