This is an early developer preview of Python 3.15
python.org/downloads/release/python-3150a1
Python 3.15 is still in development. This release, 3.15.0a1, is the first of seven planned alpha releases.
Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.
During the alpha phase, features may be added up until the start of the beta phase (2026-05-05) and, if necessary, may be modified or deleted up until the release candidate phase (2026-07-28). Please keep in mind that this is a preview release and its use is not recommended for production environments.
Many new features for Python 3.15 are still being planned and written. Among the new major new features and changes so far:
PyBytesWriter C API to create a Python bytes objectThe next pre-release of Python 3.15 will be 3.15.0a2, currently scheduled for 2025-11-18.
And hence not only at substantiated times, upon well known separate feeding-grounds, could Ahab hope to encounter his prey; but in crossing the widest expanses of water between those grounds he could, by his art, so place and time himself on his way, as even then not to be wholly without prospect of a meeting.
Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organisation contributions to the Python Software Foundation.
Regards from Helsinki before the first PyCon Finland in 9 years,
Your release team,
Hugo van Kemenade
Ned Deily
Steve Dower
Łukasz Langa
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