Pyproject uses the term packages for things to include (modules, packages, directories of python code): https://python-poetry.org/docs/pyproject/ python-packaging (setup.py) uses

install_requires: <https://python-packaging.readthedocs.io/en/latest/dependencies.html|https://python-packaging.readthedocs.io/en/latest/dependencies.html>

setup.py

uses packages to name the code that is around the file and not explicitly named within the file.