Python 3.15.0 candidate 2 is here!

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On September 1, 2026, Simon Willison reported that the second candidate version (candidate 2) of Python 3.15.0 has been released. This version is an important milestone in the Python 3.15 series, aiming to integrate community feedback and advance towards the release of the final stable version. This update includes several core improvements and feature enhancements, covering key areas such as performance optimization, syntax adjustments, and improved ecosystem compatibility, marking a new stage in the evolution of the Python language.

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S Simon Willison en 2026-09-01 22:59

Python 3.15.0 Candidate Version 2 has been released, announced by Hugo van Kemenade, the release manager for Python 3.14 and 3.15. This version is scheduled to be officially released in October, during which only reviewed and valid bug fixes are allowed to be submitted. Maintainers are encouraged to prepare their projects during this period and release the 3.15.0 wheel on PyPI to assist with testing; the binary wheels built based on the candidate version will be compatible with future Python 3.15 versions. GitHub Actions has not yet provided support for this RC version, but automatic testing switching can be achieved by configuring actions/setup-python@v7 and setting the allow-prereleases and check-latest flags. Currently, the Datasette and sqlite-utils tests have passed, while LLM is awaiting scikit-learn version 3…