This is an early developer preview of Python 3.15
www.python.org/downloads/release/python-3150a7/
Python 3.15 is still in development. This release, 3.15.0a7, is the seventh of eight 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:
frozendict built-in type* and **TypedDict with typed extra itemsTypeFormPyBytesWriter C API to create a Python bytes objectThe next pre-release of Python 3.15 will be 3.15.0a8, currently scheduled for 2026-04-07.
And thus, while the one ship went cheerily before the breeze, the other stubbornly fought against it; and so the two vessels parted; the crew of the Pequod looking with grave, lingering glances towards the receding Bachelor; but the Bachelor’s men never heeding their gaze for the lively revelry they were in. And as Ahab, leaning over the taffrail, eyed the homeward-bound craft, he took from his pocket a small vial of sand, and then looking from the ship to the vial, seemed thereby bringing two remote associations together, for that vial was filled with Nantucket soundings.
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 as spring melts the snow,
Your release team,
Hugo van Kemenade
Ned Deily
Steve Dower
Łukasz Langa