gh-119057: Use better error messages for zero division

[sobolevn]

Now these two errors are very similar:

>>> 1 // 0
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    1 // 0
    ~~^^~~
ZeroDivisionError: integer floor division by zero

>>> 1.5 // 0
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    1.5 // 0
    ~~~~^^~~
ZeroDivisionError: float floor division by zero

Better wording is always welcome!

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

---

📚 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.