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

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

Now we have exception chaining, so Serhiy's pattern is even simpler to implement than with exception wrappers.

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nosy: +iritkatriel

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<https://bugs.python.org/issue14739>
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