Post #15389

#python Python 3.15.0 alpha 3 is an early test version you can build from source on Unix/Linux/macOS with simple steps: `./configure`, `make`, `make test`, `sudo make install`. Use `--enable-optimizations` for faster performance via PGO, run `make test` to check it works, and `make altinstall` for multiple versions side-by-side. Access docs at docs.python.org/3.15, source at github.com/python/cpython, and contribute via the dev guide. This helps you test new features early, optimize your code, and prepare projects ahead of the stable release for better speed and reliability. https://github.com/python/cpython