[issue40545] Expose _PyErr_GetTopmostException

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> I would definitely love to have a public API for this.

I'm not sure if it's a good idea. It's kind of semi-internal.

Stephan Behnel and Mark Shannon: What do you think of exposing PyThreadState exception stack (exc_state)? Especially the "top" exception. If I recall correctly, Mark designed it and Stephan "reimplemented" it in Cython.

I also recall a minor issue in greenlet:
https://github.com/python-greenlet/greenlet/pull/132

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nosy: +Mark.Shannon, scoder

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