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Use Python 3.12 for the documentation build - #12109
SamuelAdigos wants to merge 1 commit into
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Netlify deploy previews have been failing on every pull request since
late September 2026. The Netlify build image now installs Python with
mise 2026.9.14, which requires GitHub artifact attestations, and the
pinned Python 3.8 (3.8.20) has none:
mise ERROR Failed to install core:python@3.8: No GitHub artifact
attestations found for python@3.8.20
Bump the documentation Python version to 3.12 in runtime.txt, the docs
service in docker-compose.yml and the contributing guide.
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📝 Walkthrough
Merge Risk: ⚪ Minimal · up to The documentation runtime selections now agree on Python 3.12, with no concrete build incompatibility identified. Netlify’s effective base directory and deployment build were not verified. Pre-merge checks ·
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly and concisely describes the main change: updating the documentation build to Python 3.12. |
| Description check | |
The description explains the deployment failure, identifies the Python 3.8 attestation issue, lists the affected files, and documents verification results. It provides sufficient context for the chang… |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
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Netlify deploy previews have been failing on every pull request since late September 2026 (e.g. #12101, #12106).
The deploy log fails during "Initializing", before the docs are built:
The Netlify build image now installs Python with mise, which verifies GitHub artifact attestations for the
python-build-standalone binaries. Python 3.8 (pinned in
runtime.txt) is end-of-life and its last build predatesattestations, so it can no longer be installed.
This bumps the documentation Python version to 3.12 in
runtime.txt, and, as in the previous bump (75ac1d1),also in the
docsservice ofdocker-compose.ymland in the contributing guide.requirements.txtis unchanged.Verification
cpython-3.12.15+20261009) has GitHub attestations.pip install -r requirements.txt && mkdocs buildsucceeds with no warnings on Python 3.8, 3.12 and 3.13, and insidethe
python:3.12image used bydocker-compose.yml(same 205 files generated).(Markdown/Pygments): quotes in code blocks are no longer escaped as
"(renders identically), and YAML blocks onthe CI pages now get syntax highlighting.
Summary by CodeRabbit