The final version of Python 3.9 is scheduled for release in early October, so Python maintainers believe it makes sense to remove the 2.7 compatibility layers.

Learn how to get Python up and running on Windows, macOS, or Linux—and avoid the biggest pitfalls along the way.

Python 3.13’s installer lets you install the free-threaded build of Python side-by-side with the regular build. You can use the “py” utility to select which one to use for a given program.