Python 3.15
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Release date: Oct. 9, 2026
Python 3.15.0 is the newest major release of the Python programming language, and it contains many new features and optimisations compared to Python 3.14, in 5,643 commits from 1,012 contributors.
Some of the major new features and changes in Python 3.15 are:
For more details on the changes to Python 3.15, see What’s new in Python 3.15.
When running IDLE or other GUI applications that use the tkinter module, these applications may hang when using an application’s menu command that opens a dialog (for example, IDLE’s About IDLE, Settings, and Open Module commands) resulting in a spinning beach ball with Force Quit needed.
This problem is due to an operating system behavior change in macOS 27.0 that is believed to affect all current versions of the Tk graphics toolkit and thus the tkinter module in all current Python versions.
If you depend on Tk-based applications (like IDLE) on macOS, you may want to consider deferring installing macOS 27.0 until a Tk or macOS workaround is available or testing that your application workflow is not affected. Follow issue #158053 for updates.
To celebrate the new 3.15, Barry Warsaw has a present for us!
I had this idea to whip up a little TUI adventure game that takes you through a What’s New in Python 3.15. I present to you “whatsnewt”:
A TUI text adventure through what’s new in Python 3.15.
You wake up in the Startup Foyer, somewhere inside the interpreter, and work your way to the Release Gate. Along the way there are eighteen puzzles, and every one of them is a real 3.15 feature you have to actually use. You’re not just answering boring questions, you’re actually writing and running code, in a Python 3.15 interpreter.
Some puzzles require a type checker, and in those cases, answers are verified by pyrefly, which is a dependency for exactly that reason, and the verdict quotes what it says back.
The easiest way to play it is to run:
uvx —python 3.15 whatsnewt
And yes, there are easter eggs
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.
Huge thanks to Georgi Ker and Marie Nordin for the Python 3.15 logo!
And also huge thanks to the Sovereign Tech Agency for supporting Hugo van Kemenade’s work as release manager for Python 3.14 and 3.15 through the Sovereign Tech Fellowship.
Download macOS installer
Download Python install manager
Download XZ compressed source tarball