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Track Python 3.15 core dependency compatibility #56
Description
Engineer currently declares Requires-Python: >=3.12,<3.15 under the ecosystem Python 3.15 waiting policy. Python 3.12 through 3.14 remain the supported release range.
Run a visible, non-blocking Python 3.15 core canary at least monthly. Recheck immediately when Python 3.15 final ships or when Polars publishes a stable release after 1.44.2. Removing the upper bound requires the complete non-hardware-dependent suite, package build, and installed-wheel import to pass on Linux, macOS, and Windows.
This is an external-dependency waiting record, not a blocker for an otherwise qualified 0.1 patch release. Tracked by ml4t/ecosystem#33 and Decision 0013.
Activity
stefan-jansen commentedon Sep 21, 2026
Initial evidence on 2026-09-20:
pydantic-core==2.46.5, which has no CPython 3.15 wheel.Keep this issue open. Recheck on Python 3.15 final or after a stable Polars release newer than 1.44.2, then require the full Linux, macOS, and Windows qualification before removing the upper bound.
stefan-jansen commentedon Oct 15, 2026
Keep this issue open and retain Requires-Python >=3.12,<3.15. The missing closure evidence is current-main qualification with Python 3.15 final on Linux, macOS and Windows, including the complete eligible test suite, package build and installed-wheel import.
The useful local maintenance is now integrated through #77 and #86: numeric side validation supports Polars 2, the monthly canary installs pytest-cov, and the reusable workflow consumers use the reviewed trigger-based exception policy. Current main also adopts pandas-market-calendars >=5.5 with corrected modern CME break handling and historical-break regressions. Python 3.12-3.14 qualification passed for those merged changes.
The earlier 3,997-test local Python 3.15 result belongs to prepared revision c48069c, not current main. That branch includes the subsequently withdrawn pandas-market-calendars <5.5 cap, so neither merging that branch wholesale nor reusing its local result establishes present 3.15 support. Its useful bar and workflow changes match the integrated source; the obsolete calendar cap must not be restored.
Next technical action: qualify current main with the final interpreter on all three hosted platforms through the shared qualification setup. Only after those results, build and installed-wheel import pass should a focused compatibility PR remove the upper bound. The existing supported-range patch release does not depend on declaring Python 3.15 supported.
AI assistance: Codex reconciled the prepared branch with merged source, inspected the issue's closure contract, and prepared this maintenance assessment. No Python 3.15 hosted final-platform result is claimed here.
test: install schedule provider for core calendar qualification (#56)
fix(ci): qualify final Python 3.15 reference dependencies (#56)
fix(ci): budget final Python native dependency builds before qualific…
ci: integrate temporal main and complete Python support guidance (#56)
ci: qualify Python 3.15 final across supported platforms (#93)
stefan-jansen commentedon Oct 18, 2026
Completed through #93 and #105. Current main c69e7ba is qualified with final CPython 3.15.0 on Linux, macOS and Windows, alongside Python 3.12-3.14.
All twelve installed-wheel cells passed 4,695 eligible tests each, type checking and executable documentation workflows. Each cell verified the actual installed version, site-packages origin and all 200 package files against the commit-bound wheel. All twelve native cells also passed, including ten fresh-process MACD runs, both public-order runs and twelve isolated cold calls per cell. The interpreter-specific cache fix was verified through real cold builds/cache saves and warm reuse, not a configuration-only assertion.
Fresh actual-main checks completed with 46 successes and two configured inapplicable skips, with no pending or failing contexts. Source qualification, coverage thresholds, security, strict docs and final package verification passed. Coverage's configured critical thresholds passed at 96.01% lines and 89.99% branches.
Installed-wheel CI: https://github.com/ml4t/engineer/actions/runs/39101647669
Native qualification: https://github.com/ml4t/engineer/actions/runs/39101647706
Shared source qualification: https://github.com/ml4t/engineer/actions/runs/39101647951
This closes the source compatibility waiting record, not a release announcement. Published 0.1.6 still excludes Python 3.15. Current development includes breaking calendar changes and targets the next minor release, 0.2.0; publication and documentation deployment remain separate decisions.
AI assistance: Codex reproduced the dependency/cache failures, implemented and reviewed the repairs, inspected the actual hosted logs and artifacts, and prepared this closure evidence. No independent human review or publication is claimed.