[issue34756] Few changes in sys.breakpointhook()

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

Hi Serhiy.  I'm curious whether this is a pure clean up or if there are actual problems you're trying to fix.

* I'm okay with using _PyObject_GetBuiltin() but it does bother me in general to use too many non-public (and thus undocumented) APIs.  It makes understanding what's going on more difficult.  This is a general gripe of mine with Python's C API.

* Given that removing support for callable modules is technically a backward incompatible change, is it worth it?  If we had done it before 3.7 was released, it would have been fine, but now we can't guarantee it won't break someone's code.  I agree it's unlikely, but it is possible.

* Perhaps we should explicitly pass through KeyboardInterrupt and MemoryError rather than just ignoring ImportError and AttributeError.

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<https://bugs.python.org/issue34756>
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