Python 3.15.0 added to actions/python-versions

Summary

Python 3.15.0 has been added to the actions/python-versions repository. This allows developers to directly include the '3.15' version in their GitHub Actions test matrices. Simon Willison describes this change as a small but long-awaited infrastructure update.

Why it matters

For teams using CI pipelines, this closes the gap between a new Python version's release and its availability in automated tests. Tests can now be run without pinning to a custom Docker image. However, this highlights a recurring friction point: the python-versions repository is a manually managed, community-maintained list that lags behind official releases. It creates a silent dependency bottleneck for anyone wanting to test the latest stable version immediately.

Highlights

• The "3.15" version can now be added directly to the GitHub Actions test matrix
• Willison tasked ChatGPT with querying the repository hourly until the entry appeared
• The update was not an automated pipeline; it was a manual addition to a community-managed list

Critical take

This is essentially a one-line changelog entry dressed up as a blog post. The real issue is the fragile process where someone must manually edit a JSON file before a new Python version becomes available in CI. This gap can and should be eliminated through automation.