Re: [HEADS UP] Fedora 35 Python 3.10 rebuilds have started in a side tag

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On Mon, Jun 14, 2021 at 2:54 PM Miro Hrončok <mhroncok@xxxxxxxxxx> wrote:
>
> On 14. 06. 21 14:17, Miro Hrončok wrote:
> >> I see one problem with the Rust bindings for CPython / libpython,
> >> where the test suite now fails with Python 3.10:
> >> https://koschei.fedoraproject.org/package/rust-cpython?
> >>
> >> Looking at the build log, the new test failures seem to be caused by
> >> either API removals or subtle behaviour changes:
> >>
> >> - TypeError: 'float' object cannot be interpreted as an integer
> >
> > Indeed. wrap it in int() or math.floor()/ceil() as needed.
> >
> > I suspect this is related to:
> >
> > https://docs.python.org/3.10/whatsnew/3.10.html#other-language-changes
> >
> > """
> > Builtin and extension functions that take integer arguments no longer accept
> > Decimals, Fractions and other objects that can be converted to integers only
> > with a loss (e.g. that have the __int__() method but do not have the
> > __index__() method). https://bugs.python.org/issue37999
> > """
>
> Can I get the Python traceback somehow? The rust thing (object?) seem to have:
>
> PyErr { ptype: <class 'TypeError'>, pvalue: Some("'float' object cannot be
> interpreted as an integer"), ptraceback: None }

Not sure ... looking at the sources for the tests:
https://github.com/dgrunwald/rust-cpython/blob/master/src/objects/num.rs#L340
It seems that this just will not work as expected for some float ->
int -> float roundtrip conversions any longer, due to the changes in
python 3.10.

Fabio
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