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PEP 517 - A build-system independent format for source trees

distutils and setuptools suffer from the following problems:
The goal of PEP 517 is to address the third problem and to be independent of the special interest group distutils-sig.

pip …

$ pip install …
DEPRECATION: … is being installed using the legacy 'setup.py install' method,
because it does not have a 'pyproject.toml' and the 'wheel' package is not installed.
pip 23.1 will enforce this behaviour change.
A possible replacement is to enable the '--use-pep517' option.
Discussion can be found at https://github.com/pypa/pip/issues/8559

Definition of terms

This PEP defines the following terms:
A source tree is a directory containing checked out state of a version control system.
It should be possible to install directly from this directory: 
pip install the-repo
A source distribution is a snapshot of a release (for example the-repo.1.2.0.tar.gz).
A source distributions may also be referred to as sdist.
A build frontend builds a wheel from a source tree.
An integration frontend takes a set of package requirements (think requirements.txt) and tries to build a working environment from it.
With pip install lxml==2.4.0, pip acts as an integration frontend.

See also

Packaging/deployment of modules
The -C option of python3 -m build.
A small list of other interesting PEPs

Index