python.org/downloads/release/python-3150b2
This is a beta preview of Python 3.15
Python 3.15 is still in development. This release, 3.15.0b2, is the second of four planned beta releases.
Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.
We strongly encourage maintainers of third-party Python projects to test with 3.15 during the beta phase and report issues found to the Python bug tracker as soon as possible. While the release is planned to be feature-complete entering the beta phase, it is possible that features may be modified or, in rare cases, removed up until the start of the release candidate phase (2026-08-04). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.15 as possible during the beta phase.
This includes creating pre-release wheels for 3.15, as it helps other projects to do their own testing. However, we recommend that your regular production releases wait until 3.15.0rc1, to avoid the risk of ABI breaks.
Please keep in mind that this is a preview release and its use is not recommended for production environments.
Some of the major new features and changes in Python 3.15 are:
frozendict built-in typesentinel built-in typeTypedDict with typed extra itemsTypeFormPyBytesWriter C API to create a Python bytes objectFor more details on the changes to Python 3.15, see What’s new in Python 3.15. The next pre-release of Python 3.15 will be 3.15.0b3, scheduled for 2026-06-23.
“Call the first witness,” said the King; and the White Rabbit blew three blasts on the trumpet, and called out, “First witness!”
The first witness was the Hatter. He came in with a teacup in one hand and a piece of bread-and-butter in the other. “I beg pardon, your Majesty,” he began, “for bringing these in: but I hadn’t quite finished my tea when I was sent for.”
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 with a 4:06 sunrise and 22:31 sunset,
Your release team,
Hugo van Kemenade
Ned Deily
Steve Dower
Łukasz Langa