rpy fails to build with Python 3.13.0a3.

=================================== FAILURES ===================================
_____________________________ test_setitem[value1] _____________________________

value = NA_character_

    @pytest.mark.parametrize('value',
                             ('boo', ri.NA_Character))
    def test_setitem(value):
        vec = ri.StrSexpVector(['foo', 'bar', 'baz'])
        vec[1] = value
>       assert vec[1] == value
E       assert NA_character_ == NA_character_

rpy2/tests/rinterface/test_vector_str.py:33: AssertionError
_________________ test_vector_navalue[StrVector-expected_na0] __________________

cls = <class 'rpy2.robjects.vectors.StrVector'>, expected_na = NA_character_

    @pytest.mark.parametrize(
        'cls,expected_na',
        [(robjects.StrVector, ri.NA_Character),
         (robjects.IntVector, ri.NA_Integer),
         (robjects.FloatVector, ri.NA_Real),
         (robjects.BoolVector, ri.NA_Logical),
         (robjects.ComplexVector, ri.NA_Complex),
        ])
    def test_vector_navalue(cls, expected_na):
>       assert cls.NAvalue is expected_na
E       AssertionError: assert NA_character_ is NA_character_
E        +  where NA_character_ = <class 'rpy2.robjects.vectors.StrVector'>.NAvalue

rpy2/tests/robjects/test_vector.py:38: AssertionError
___________________ test_iter_labels[values1-check_values1] ____________________

values = ('abc', None, 'efg'), check_values = ('abc', NA_character_, 'efg')

    @pytest.mark.parametrize(
        'values,check_values',
        (('abaac', 'abaac'),
         (('abc', None, 'efg'), ('abc', NA_Character, 'efg'))))
    def test_iter_labels(values, check_values):
        vec = robjects.FactorVector(robjects.StrVector(values))
        it = vec.iter_labels()
        for a, b in zip(check_values, it):
>           assert a == b
E           assert NA_character_ == NA_character_

rpy2/tests/robjects/test_vector_factor.py:47: AssertionError

https://docs.python.org/3.13/whatsnew/3.13.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-rawhide-x86_64/07016135-rpy/

For all our attempts to build rpy with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/rpy/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.