python-flask-babel fails to build with Python 3.15.0a5.

____________________________ test_list_translations ____________________________

    def test_list_translations():
        app = flask.Flask(__name__)
        b = babel.Babel(app, default_locale="de_DE")
    
        with app.app_context():
            translations = b.list_translations()
            assert len(translations) == 3
>           assert str(translations[0]) == "de"
E           AssertionError: assert 'ja' == 'de'
E             
E             - de
E             + ja

tests/test_gettext.py:96: AssertionError
_________________ test_list_translations_default_locale_exists _________________

    def test_list_translations_default_locale_exists():
        app = flask.Flask(__name__)
        b = babel.Babel(app, default_locale="de")
    
        with app.app_context():
            translations = b.list_translations()
            assert len(translations) == 2
>           assert str(translations[0]) == "de"
E           AssertionError: assert 'ja' == 'de'
E             
E             - de
E             + ja

tests/test_gettext.py:108: AssertionError
__________________________ test_multiple_directories ___________________________

    def test_multiple_directories():
        """
        Ensure we can load translations from multiple directories.
    
        This also ensures that directories without any translation files
        are not taken into account.
        """
        b = babel.Babel()
        app = flask.Flask(__name__)
    
        app.config.update(
            {
                "BABEL_TRANSLATION_DIRECTORIES": ";".join(
                    ("translations", "renamed_translations")
                ),
                "BABEL_DEFAULT_LOCALE": "de_DE",
            }
        )
    
        b.init_app(app)
    
        with app.test_request_context():
            translations = b.list_translations()
    
            assert len(translations) == 4
>           assert str(translations[0]) == "de"
E           AssertionError: assert 'ja' == 'de'
E             
E             - de
E             + ja

tests/test_integration.py:44: AssertionError

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_64/10050239-python-flask-babel/

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

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.