Bug 2365823 - python-lz4 fails to build with Python 3.14: ImportError: cannot import name '_compression' from partially initialized module 'lz4.frame' (most likely due to a circular import)
Summary: python-lz4 fails to build with Python 3.14: ImportError: cannot import name '...
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: python-lz4
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Karolina Surma
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PYTHON3.14
TreeView+ depends on / blocked
 
Reported: 2025-05-13 08:57 UTC by Karolina Surma
Modified: 2025-06-11 10:47 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2025-06-11 10:47:07 UTC
Type: Bug
Embargoed:


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System ID Private Priority Status Summary Last Updated
Github python-lz4 python-lz4 issues 302 0 None open ImportError when attempting to test with Python 3.14 2025-05-29 07:33:42 UTC

Description Karolina Surma 2025-05-13 08:57:04 UTC
python-lz4 fails to build with Python 3.14.0b1.

+ /usr/bin/python3 -m tox --current-env --assert-config -q --recreate -e py314
ImportError while loading conftest '/builddir/build/BUILD/python-lz4-4.3.3-build/lz4-4.3.3/tests/frame/conftest.py'.
tests/frame/conftest.py:2: in <module>
    import lz4.frame as lz4frame
../BUILDROOT/usr/lib64/python3.14/site-packages/lz4/frame/__init__.py:30: in <module>
    from . import _compression
E   ImportError: cannot import name '_compression' from partially initialized module 'lz4.frame' (most likely due to a circular import) (/builddir/build/BUILD/python-lz4-4.3.3-build/BUILDROOT/usr/lib64/python3.14/site-packages/lz4/frame/__init__.py)

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-b1/fedora-rawhide-x86_64/09026751-python-lz4/

For all our attempts to build python-lz4 with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14-b1/package/python-lz4/

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-b1/

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.


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