[issue14739] Add PyArg_Parse format unit like O& but providing context

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

It would be better if the functions PyArg_Parse* were wrapped converter's exception, in other exception with adding the names of function and parameter in the message. This will save us from necessity of the introduction of the new interface and immediately give effect to the old code.

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nosy: +storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14739>
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