SG-45254 Drop Python 3.7/3.8 compat from build tooling (keep 3.9)

[julien-lang]

Problem

tk-toolchain still carried Python 3.7/3.8 compatibility shims and stale classifiers, left over from before those versions were dropped.

Changes

• python_requires: >=3.7.0 -> >=3.9.0 (drop 3.7/3.8, keep 3.9).
• Simplify the sphinx dependency to sphinx==7.0.0 (the sphinx==5.3.0 fallback only existed for Python < 3.9).
• Remove the jinja2==3.0.3 pin (it only existed for the old sphinx / py<3.9 path; sphinx 7 works with modern jinja on 3.9+).
• Remove the now-unused import sys (it was only used by the removed sphinx version conditional).
• Classifiers: drop 3.7, keep 3.9/3.10/3.11, add 3.13.
• conf.py intersphinx: link Python docs 3.9 -> 3.10.

Why keep 3.9

CI still runs the Python 3.9 jobs (per SG-40695 we keep testing 3.9 for compatibility as long as possible), and tk-toolchain is pip install-ed into every CI job including those. So it must remain installable on 3.9 - python_requires stays at >=3.9.0, not >=3.10.

Notes

• No version bump here, to avoid conflicting with the other open tk-toolchain PRs; versioning is left to the release process.

Related

• Part of SG-40695 (drop Python 3.7/3.9 compat). Companion decision: tk-ci-tools and tk-internal intentionally keep their 3.9 CI runs, so they need no change.

[Copilot]

🟢 Approval recommended

No unresolved review comments; the changes retain Python 3.9 support.

Pull request overview

Updates tk-toolchain to support Python 3.9+ while removing obsolete Python 3.7/3.8 compatibility.

Changes:

• Raises the minimum Python version and updates classifiers through Python 3.13.
• Simplifies Sphinx dependencies and removes the obsolete Jinja2 pin.
• Updates the Python intersphinx documentation target.

File summaries

File	Description
tk_toolchain/cmd_line_tools/tk_docs_generation/sphinx_data/conf.py	Updates the Python documentation reference.
setup.py	Updates Python requirements, dependencies, and classifiers.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.95%. Comparing base (538f78e) to head (ab4698f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #88   +/-   ##
=======================================
  Coverage   48.95%   48.95%           
=======================================
  Files          19       19           
  Lines         721      721           
=======================================
  Hits          353      353           
  Misses        368      368           

Flag	Coverage Δ
Linux	48.54% <ø> (ø)
Python-3.10	48.54% <ø> (ø)
Python-3.11	48.95% <ø> (ø)
Python-3.13	48.95% <ø> (ø)
Python-3.9	48.54% <ø> (ø)
Windows	48.53% <ø> (ø)
macOS	48.68% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.