python-etcd fails to build with Python 3.14.0a1.

____________________ TestWatch.test_watch_indexed_generator ____________________

self = <etcd.tests.integration.test_simple.TestWatch testMethod=test_watch_indexed_generator>

    def test_watch_indexed_generator(self):
        """INTEGRATION: Receive a watch event from other process, ixd, (2)"""
    
        set_result = self.client.set("/test-key", "test-value")
        set_result = self.client.set("/test-key", "test-value0")
        original_index = int(set_result.modifiedIndex)
        set_result = self.client.set("/test-key", "test-value1")
        set_result = self.client.set("/test-key", "test-value2")
    
        queue = multiprocessing.Queue()
    
        def change_value(key, newValue):
            c = etcd.Client(port=6001)
            c.set(key, newValue)
    
        def watch_value(key, index, queue):
            c = etcd.Client(port=6001)
            iterevents = c.eternal_watch(key, index=index)
            for i in range(0, 3):
                queue.put(next(iterevents).value)
    
        proc = multiprocessing.Process(
            target=change_value,
            args=(
                "/test-key",
                "test-value3",
            ),
        )
    
        watcher = multiprocessing.Process(
            target=watch_value, args=("/test-key", original_index, queue)
        )
    
>       watcher.start()

src/etcd/tests/integration/test_simple.py:398: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib64/python3.14/multiprocessing/process.py:121: in start
    self._popen = self._Popen(self)
/usr/lib64/python3.14/multiprocessing/context.py:224: in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
/usr/lib64/python3.14/multiprocessing/context.py:300: in _Popen
    return Popen(process_obj)
/usr/lib64/python3.14/multiprocessing/popen_forkserver.py:35: in __init__
    super().__init__(process_obj)
/usr/lib64/python3.14/multiprocessing/popen_fork.py:20: in __init__
    self._launch(process_obj)
/usr/lib64/python3.14/multiprocessing/popen_forkserver.py:47: in _launch
    reduction.dump(process_obj, buf)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

obj = <Process name='Process-8' parent=229 initial>
file = <_io.BytesIO object at 0x7f0d39e66ac0>, protocol = None

    def dump(obj, file, protocol=None):
        '''Replacement for pickle.dump() using ForkingPickler.'''
>       ForkingPickler(file, protocol).dump(obj)
E       _pickle.PicklingError: Can't pickle local object <function TestWatch.test_watch_indexed_generator.<locals>.watch_value at 0x7f0d39f71dd0>
E       when serializing dict item '_target'
E       when serializing multiprocessing.context.Process state
E       when serializing multiprocessing.context.Process object

/usr/lib64/python3.14/multiprocessing/reduction.py:60: PicklingError

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08198518-python-etcd/

For all our attempts to build python-etcd with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-etcd/

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 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
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.