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

distutils and setuptools suffer from the following problems:

It's not possible to declare dependencies at build time
Extending these two libraries is difficult
It is also difficult to use libraries other than these two mentioned.

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

See also

Packaging/deployment of modules

A small list of other interesting PEPs