Self-Referential Extras

Created to support pypa/packaging.python.org#2087

CI matrix for checking package managers' support for self-referential extras: optional dependencies that refer back to the same package with other extras. Workflows run weekly with the latest release version of each package manager.

Current status

Conda does not support extras before CEP 44 implementation

Commands for the test cases

Tool	add	install	sync
pip	-	python -m pip install "${WHEEL}[all]"	-
uv	uv add "${WHEEL}[all]"	uv pip install --system "${WHEEL}[all]"	uv lock uv sync
poetry	poetry add "${WHEEL}[all]"	-	poetry lock poetry sync --no-root
pdm	pdm add "${WHEEL}[all]"	-	pdm lock pdm sync
pipenv	-	pipenv install "${WHEEL}[all]"	pipenv lock pipenv sync
hatch	-	-	hatch env lock hatch dep sync
whl2conda	-	whl2conda convert "$WHEEL" --resolve-extras whl2conda install "$CONDA_PKG" --create -n self_ref_extras --yes	-

Package extras

[project.optional-dependencies]
test = ["pytest"]
format = ["ruff"]
docs = ["sphinx"]
dev = [
  "self-referential-extras[test]",
  "self-referential-extras[format]",
]
all = ["self-referential-extras[test,format,docs]"]

Installing self-referential-extras[all] should pull in pytest, ruff, and sphinx.

When was this supported?

This part may contain errors, it's kinda like my personal notes~

Tool	Version	Release Date	Related PRs
pip	21.2	2021.07	Not Intentional
pipenv	2022.8.15	2022.08	Not Intentional
pdm	2.3.1	2022.12	#1481, #1541
uv	0.5.27	2025.02	#11142
poetry	2.1.0	2025.02	#10106
hatch	1.16.3	2026.01	#2127
whl2conda	-	-	-