This is a low-level library for calling build-backends in
pyproject.toml-based projects. It provides the basic functionality
to help write tooling that generates distribution files from Python
projects.

If you want a tool that builds Python packages, you'll want to use
https://github.com/pypa/build instead. This is an underlying piece for
pip, build and other "build frontends" use to call "build backends"
within them.