Migrate flux tests to Python 3.13 #877
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Important Review skippedDraft detected. Please check the settings in the CodeRabbit UI or the You can disable this status message by setting the 📝 WalkthroughWalkthroughThe CI workflow configuration was updated to use Python 3.13 instead of 3.12 in two separate environment setup sections: one for OpenMPI-related steps and another for MPICH-related steps. Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Poem
Pre-merge checks✅ Passed checks (3 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #877 +/- ##
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Coverage 93.27% 93.27%
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Files 38 38
Lines 1800 1800
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Hits 1679 1679
Misses 121 121 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Actionable comments posted: 1
📜 Review details
Configuration used: defaults
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
.github/workflows/pipeline.yml
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- GitHub Check: unittest_mpich (ubuntu-latest, 3.13)
- GitHub Check: unittest_mpich (ubuntu-22.04-arm, 3.13)
- GitHub Check: unittest_mpich (ubuntu-latest, 3.11)
- GitHub Check: unittest_mpich (macos-latest, 3.13)
- GitHub Check: unittest_openmpi (ubuntu-24.04-arm, 3.13)
- GitHub Check: unittest_openmpi (ubuntu-latest, 3.11)
- GitHub Check: unittest_mpich (ubuntu-24.04-arm, 3.13)
- GitHub Check: unittest_openmpi (ubuntu-latest, 3.12)
- GitHub Check: unittest_openmpi (ubuntu-latest, 3.13)
- GitHub Check: unittest_mpich (ubuntu-latest, 3.12)
- GitHub Check: unittest_openmpi (macos-latest, 3.13)
- GitHub Check: unittest_openmpi (ubuntu-22.04-arm, 3.13)
- GitHub Check: unittest_flux_openmpi
- GitHub Check: benchmark (ubuntu-latest, 3.13, .ci_support/environment-mpich.yml)
- GitHub Check: unittest_win
- GitHub Check: unittest_slurm_mpich
- GitHub Check: unittest_flux_mpich
- GitHub Check: unittest_old
- GitHub Check: benchmark (ubuntu-latest, 3.13, .ci_support/environment-openmpi.yml)
- GitHub Check: notebooks
🔇 Additional comments (2)
.github/workflows/pipeline.yml (2)
152-152: Consider updating notebooks jobs that also use flux.The
notebooks(line 152) andnotebooks_integration(line 177) jobs execute flux commands (flux start papermill...at lines 165-166 and 189-190) but remain on Python 3.12.Should these jobs also be migrated to Python 3.13 as part of this PR, or is there a specific reason they should remain on 3.12 (e.g., notebook dependencies)?
Also applies to: 177-177
205-205: Python 3.13 upgrade is compatible with flux-core 0.81.0.The version bump aligns with the PR objectives. flux-core 0.81.0 supports Python 3.12 or later, so Python 3.13 is fully supported.
| - uses: conda-incubator/setup-miniconda@v3 | ||
| with: | ||
| python-version: '3.12' | ||
| python-version: '3.13' |
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🧩 Analysis chain
🌐 Web query:
flux-core 0.81.0 Python 3.13 support compatibility
💡 Result:
Short answer: No — flux-core 0.81.0 does not list official Python 3.13 support.
Evidence:
- flux-core 0.81.0 release notes (published Dec 2–3, 2025) make no mention of Python 3.13 support. [1]
- The project explicitly added Python 3.12 support in v0.59.0 (Feb 6, 2024), but later release notes and PyPI / flux-python artifacts for recent releases show wheels for CPython up to 3.11 (no cp313 wheel listed). [2][3]
If you need Python 3.13: you can either run flux-core with a supported Python (3.10–3.12/3.11 per the package artifacts) or try building the Python bindings from source against Python 3.13 (unsupported — may require patching). References: [1] flux-core v0.81.0 release notes; [2] flux-core v0.59.0 (Python 3.12 mention); [3] flux-python / PyPI wheel listings.
🌐 Web query:
flux-pmix 0.6.0 Python 3.13 support compatibility
💡 Result:
Short answer: flux-pmix 0.6.0 does not list official Python 3.13 support. flux-pmix is a Flux PMI plugin (C code) and does not itself declare a python_requires; Python compatibility for Flux features is governed by flux-core / flux-python, and the project added official Python 3.12 support (not 3.13) in flux-core releases. [1][2]
What to do next
- If you need runtime Python integration, use a flux-core / flux-python build that matches your Python interpreter; current official notes show support through Python 3.12. Test on 3.13 in a separate environment if you must use it. [1][2]
Sources
- flux-core release notes (Python 3.12 support). [1]
- flux-pmix package listings / repository (release versions including 0.6.0). [2]
Downgrade to Python 3.12 — flux-core 0.81.0 and flux-pmix 0.6.0 do not support Python 3.13.
flux-core 0.81.0 does not list Python 3.13 support. Official wheels are only built for CPython up to 3.11, with Python 3.12 being the latest officially supported version. flux-pmix 0.6.0 follows the same constraint. Change line 236 to python-version: '3.12'.
🤖 Prompt for AI Agents
In .github/workflows/pipeline.yml around line 236, the workflow sets
python-version to '3.13' but flux-core 0.81.0 and flux-pmix 0.6.0 do not support
3.13; change the value to '3.12' so the CI uses Python 3.12; update the line to
python-version: '3.12' and commit the workflow change.
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