gh-119057: Use better error messages for zero division

[sobolevn]

Now these two errors are very similar:

>>>1//0Traceback (mostrecentcalllast): File"<python-input-0>", line1, in<module>1//0~~^^~~ZeroDivisionError: integerfloordivisionbyzero

>>>1.5//0Traceback (mostrecentcalllast): File"<python-input-1>", line1, in<module>1.5//0~~~~^^~~ZeroDivisionError: floatfloordivisionbyzero

Better wording is always welcome!

• Issue: Make ZeroDivisionError message more precise when floor-dividing by zero #119057

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📚 Documentation preview 📚: https://cpython-previews--119066.org.readthedocs.build/

[mdickinson]

The code changes look fine to me in principle. I think there's still some wrangling to do over the exact error messages we want - we need to resolve that on the issue.

[mdickinson]

LGTM - thank you! I searched for missing cases of both ZeroDivisionError and PyExc_ZeroDivisionError and didn't find any.

I'm a little horrified at how often we use ZeroDivisionError in random tests that have nothing to do with arithmetic, but that's another story ...

[sobolevn]

Thanks a lot for the help and review! 👍
Usually we don't backport error messages changes.

I will open a new issue about ZeroDivisionError refactor.