osc fails to build with Python 3.15.0b1.

ERROR: test_unknown_options (tests.test_commandline.TestCommandClasses.test_unknown_options)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/osc-1.26.0-build/osc-1.26.0/tests/test_commandline.py", line 126, in test_unknown_options
    self.assertRaises(SystemExit, main.parse_args, ["test-cmd", "--unknown-option"])
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.15/unittest/case.py", line 835, in assertRaises
    return context.handle('assertRaises', args, kwargs)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.15/unittest/case.py", line 245, in handle
    callable_obj(*args, **kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/osc-1.26.0-build/osc-1.26.0/osc/commandline_common.py", line 295, in parse_args
    self.parser.error(f"unrecognized arguments: " + " ".join(unrecognized))
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.15/argparse.py", line 2918, in error
    self.print_usage(_sys.stderr)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/usr/lib64/python3.15/argparse.py", line 2864, in print_usage
    formatter = self._get_formatter(file=file)
TypeError: OscArgumentParser._get_formatter() got an unexpected keyword argument 'file'


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-b1/fedora-rawhide-x86_64/10510089-osc/

For all our attempts to build osc with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15-b1/package/osc/

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-b1/

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.