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.

Mojo is a superset of Python, which means anything written in Python will compile and run in the Mojo environment. However, Mojo is close to 70,000 times faster than Python, and it can be used all ...