"Note: It's another magic release. We fixed another bug that required bumping the magic number stored in Python bytecode (.pyc) files. This means file .pyc files created for rc2 cannot be used for rc3, and they'll be recompiled. The ABI isn't changing. Wheels built for rc1 should be fine for rc2, rc3 and 3.14.x, so this shouldn't affect too many people."
"This release, 3.14.0rc3, is the final release preview. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The next release of Python 3.14 will be the final release, 3.14.0, scheduled for Tuesday, 2025-10-07. There will be no ABI changes from this point forward in the 3.14 series, and the goal is that there will be as few code changes as possible."
Python 3.14.0rc3 is the final release preview and introduces another bytecode magic number bump that invalidates .pyc files from rc2, which will be recompiled. The ABI is unchanged, and wheels built for rc1 should work for rc2, rc3, and 3.14.x. Only reviewed bug-fix code changes are allowed between this release candidate and the final release. The final 3.14.0 is scheduled for 2025-10-07. Maintainers of third-party projects are encouraged to prepare and publish Python 3.14 wheels on PyPI and to test their projects. This preview is not recommended for production. Core developers are urged to finalize documentation and What's New entries and report issues to the bug tracker.
Read at Pythoninsider
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