Bug 2423877

Summary: python-distlib fails to build with Python 3.15: TypeError: cache_from_source() takes 1 positional argument but 2 were given
Product: [Fedora] Fedora Reporter: Karolina Surma <ksurma>
Component: python-distlibAssignee: Charalampos Stratakis <cstratak>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: cstratak, ksurma, logans, mhroncok, python-packagers-sig, vstinner
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OS: Unspecified   
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Fixed In Version: python-distlib-0.4.0-5.fc44 Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-01-23 18:23:23 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2412434    

Description Karolina Surma 2025-12-19 14:16:14 UTC
python-distlib fails to build with Python 3.15.0a3.

______________________ FileOpsTestCase.test_byte_compile _______________________

self = <test_util.FileOpsTestCase testMethod=test_byte_compile>

    def test_byte_compile(self):
        path = os.path.join(self.workdir, 'hello.py')
>       dpath = cache_from_source(path, True)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       TypeError: cache_from_source() takes 1 positional argument but 2 were given

tests/test_util.py:655: TypeError

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_64/09935313-python-distlib/

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

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.

Comment 1 Victor Stinner 2026-01-14 13:50:34 UTC
I wrote https://github.com/pypa/distlib/pull/256 to fix the issue.

Comment 2 Fedora Update System 2026-01-23 18:20:45 UTC
FEDORA-2026-fc6d89c3df (python-distlib-0.4.0-5.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-fc6d89c3df

Comment 3 Fedora Update System 2026-01-23 18:23:23 UTC
FEDORA-2026-fc6d89c3df (python-distlib-0.4.0-5.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.