Bug 2440691

python-patsy fails to build with Python 3.15.0a6.

__________________________ test__tokenize_constraint ___________________________

    def test__tokenize_constraint():
        code = "2 * (a + b) = q"
>       tokens = _tokenize_constraint(code, ["a", "b", "q"])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

patsy/constraint.py:219: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
patsy/constraint.py:206: in _tokenize_constraint
    scanner = re.Scanner(lexicon)
              ^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <re.Scanner object at 0x7fecab4c8d70>
lexicon = [('\\(', <function _token_maker.<locals>.make_token at 0x7fecc44621f0>), ('\\)', <function _token_maker.<locals>.make_...+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?', <function _token_maker.<locals>.make_token at 0x7fecc44624b0>), ('\\s+', None)]
flags = 0

    def __init__(self, lexicon, flags=0):
        from ._constants import BRANCH, SUBPATTERN
        if isinstance(flags, RegexFlag):
            flags = flags.value
        self.lexicon = lexicon
        # combine phrases into a compound pattern
        p = []
        s = _parser.State()
        s.flags = flags
        for phrase, action in lexicon:
            sub_pattern = _parser.parse(phrase, flags)
            if sub_pattern.state.groups != 1:
>               raise ValueError("Cannot use capturing groups in re.Scanner")
E               ValueError: Cannot use capturing groups in re.Scanner

FAILED patsy/constraint.py::test__tokenize_constraint - ValueError: Cannot us...
FAILED patsy/constraint.py::test_linear_constraint - ValueError: Cannot use c...
FAILED patsy/constraint.py::test_eval_errors - ValueError: Cannot use capturi...
FAILED patsy/design_info.py::test_DesignInfo_linear_constraint - ValueError: ...

https://docs.python.org/3.15/whatsnew/3.15.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.15/fedora-rawhide-x86_64/10145482-python-patsy/

For all our attempts to build python-patsy with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/python-patsy/

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 3.15:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/

Let us know here if you have any questions.

Python 3.15 is planned to be included in Fedora 45.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15.
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.