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Migrate flux tests to Python 3.13 #877

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Merged
jan-janssen merged 7 commits into from
Jan 4, 2026
Merged

Migrate flux tests to Python 3.13 #877

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e9072bb
Migrate flux tests to Python 3.13
jan-janssen Jan 2, 2026
695ab68
Update pipeline.yml
jan-janssen Jan 2, 2026
058a391
Update environment-integration.yml
jan-janssen Jan 2, 2026
6fabb5d
Update environment-integration.yml
jan-janssen Jan 2, 2026
87645f1
Merge branch 'main' into py313flux
jan-janssen Jan 4, 2026
b6ac975
Update environment-integration.yml
jan-janssen Jan 4, 2026
ca8dc16
Merge branch 'main' into py313flux
jan-janssen Jan 4, 2026
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8 changes: 4 additions & 4 deletions .github/workflows/pipeline.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,7 @@ jobs:
- name: Setup Mambaforge
uses: conda-incubator/setup-miniconda@v3
with:
python-version: "3.12"
python-version: "3.13"
miniforge-version: latest
channels: conda-forge
conda-remove-defaults: "true"
Expand All @@ -174,7 +174,7 @@ jobs:
- name: Setup Mambaforge
uses: conda-incubator/setup-miniconda@v3
with:
python-version: "3.12"
python-version: "3.13"
miniforge-version: latest
channels: conda-forge
conda-remove-defaults: "true"
Expand Down Expand Up @@ -202,7 +202,7 @@ jobs:
cat .ci_support/environment-mpich.yml
- uses: conda-incubator/setup-miniconda@v3
with:
python-version: '3.12'
python-version: '3.13'
miniforge-version: latest
channels: conda-forge
conda-remove-defaults: "true"
Expand Down Expand Up @@ -233,7 +233,7 @@ jobs:
cat .ci_support/environment-openmpi.yml
- uses: conda-incubator/setup-miniconda@v3
with:
python-version: '3.12'
python-version: '3.13'
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⚠️ Potential issue | 🔴 Critical

🧩 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.

miniforge-version: latest
channels: conda-forge
conda-remove-defaults: "true"
Expand Down
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