2025.02.09 💝

This release improves PEP 723 support, including adding dependencies to the noxfile itself ("plugins"). It adds the long-awaited "requires" option, allowing sessions to require other sessions. And it brings further improvements to the pyproject.toml support, including helpers for dependency-groups and Python version lists.

We'd like to thank the following folks who contributed to this release:

• @btemplep (first contribution)
• @chirizxc (first contribution)
• @davidhewitt (first contribution)
• @gschaffner (first contribution)
• @henryiii
• @oliversen (first contribution)

New features:

• Support PEP 723 noxfiles by @henryiii in #881
• Expose main as nox.main by @henryiii in #878 (followup fix: #884)
• Support session dependencies (requires) by @gschaffner in #631
• Helper to get dependency-groups by @henryiii in #876
• Helper to get the Python listing by @henryiii in #877
• Add a "pyproject.toml" default for load_toml by @henryiii in #917

Bugfixes:

• Correct virtualenv bin dir under mingw python by @davidhewitt in #901
• Allow pypy-* to be used as well for pypy* (matching GHA) by @henryiii in #913
• Don't trigger a background update process for virtualenv by @henryiii in #918
• Include encoding for consistent behavior (default in Python 3.15+) by @henryiii in #891
• Outer env issues fixed by @henryiii in #874
• Support noxfile being a symlink by @henryiii in #829
• Drop PyPy from the default list for the GitHub Action by @henryiii in #916

Bugfixes related to uv support:

• Catch PermissionError from popen when UV is not installed by @btemplep in #908
• Use uv python install only with uv backend by @oliversen in #900
• Handle "uvx" like "uv" by @henryiii in #920
• Support broken uv (via pyenv) by @henryiii in #922

Tox-to-nox script:

• Drop support for tox 3 by @henryiii in #910
• Switch pkgutil for importlib-resources by @henryiii in #887
• Correctly separate command-line arguments by @chirizxc in #906

Improved noxfile validation:

• Error if invalid reuse_venv set by @henryiii in #872
• Error with helpful message if invalid option is set via nox.options by @henryiii in #871 (followup fix: #921)
• Validate entries in nox.config, too, using attrs by @henryiii in #880

Internal changes:

• Add more Ruff checks and fixes by @henryiii in #893
• Cleanup symlink noxfile code by @henryiii in #865
• Drop some type ignores for colorlog by @henryiii in #888
• Limit the visible items for tab completion by @henryiii in #889
• More typing and test improvements by @henryiii in #890
• Some extra simplifications from Ruff by @henryiii in #870
• Use dependency-groups by @henryiii in #873
• Pull out env creation into helper method by @henryiii in #912
• Pulled out get_virtualenv & better typing by @henryiii in #882
• Fix broken mock on CPython 3.12.8+ in tests by @henryiii in #903
• Statically type tests by @henryiii in #894
• Use tmp_path instead of tmpdir in tests by @henryiii in #895

2024.10.09 🎃

This release adds explicit support for Python 3.13 and drops support for running Nox itself under Python 3.7. Note that you can still use 3.7 in your Nox sessions, we just dropped support for installing & running nox itself in 3.7.

We'd like to thank the following folks who conributed to this release:

• @edgarrmondragon
• @ember91
• @henryiii
• @hmd101
• @KasperZutterman
• @living180
• @mayeut
• @saucoide
• @Wurstnase

New features:

• Allow setting tags on parametrized sessions by @living180 in #832
• Added support for uv-installed pythons by @saucoide in #842
• Added session.install_and_run_script by @henryiii in #847

Bugfixes:

• Updated type annotation of stderr parameter to make it optional by @edgarrmondragon in #835
• Removed add_timestamp from noxfile.options by @Wurstnase in #856

Documentation:

• Added warning about uv and local packages by @henryiii in #830
• Fixed contribution guidelines by @Wurstnase in #850
• Fixed typos by @ember91 in #839
• Fixed typoss in cookbook by @hmd101 in #837
• Added missing cookbook recipe snippet imports by @KasperZutterman in #853
• Cleaned up dev recipe by @henryiii in #862
• Added note about uv reinstall by @henryiii in #863
• Added uv sync example by @henryiii in #864

Internal changes:

• Use default action tests for macos-14 by @mayeut in #824
• Added 3.13 to the action defaults by @henryiii in #846
• Dropped Python 3.7 by @henryiii in #822
• Included 3.13 in classifiers by @henryiii in #851
• Use uv if available in action by @henryiii in #831
• Run tests with Python 3.13 by @edgarrmondragon in #834
• Updated macos-latest to macos-14 by @henryiii in #821
• Use miniforge by @henryiii in #854
• Use astral-sh/setup-uv by @henryiii in #859
• Dropped PyPy 3.9 from test matrix by @henryiii in #858

2024.04.15 🪼

We'd like to thank the following folks who contributed to this release:

• @cjolowicz
• @henryiii
• @mayeut

New features:

• Added support for PEP 723 (inline script metadata) with nox.project.load_toml by @henryiii in #811
• Added support for micromamba by @henryiii in #807
• Added venv_backend property to sessions by @henryiii in #798
• Added the ability to use None to remove environment variables by @henryiii in #812
• Added support for skipping sessions by default using default=False by @henryiii in #810

Bugfixes:

• Use static arguments instead of **kwargs by @henryiii in #815
• Do not depend on pipx in Nox GitHub action by @mayeut in #768
• Disallow UV_SYSTEM_PYTHON by @henryiii in #817
• Ensure 'uv' always works in a uv venv by @henryiii in #818
• Look for uv next to python if it's not on PATH by @cjolowicz in #795
• Fixed missing f-string in --help message by @cjolowicz in #790
• Don't error if not installing to passthrough by @henryiii in #809
• Avoid mixing venv and conda from environment by @henryiii in #804
• Skip test for conda env when conda isn't installed by @cjolowicz in #794

2024.03.02

We'd like to thank the following folks who contributed to this release:

• @DiddiLeija
• @MicaelJarniac
• @chrysle
• @edgarrmondragon
• @fazledyn-or
• @franekmagiera
• @frenzymadness
• @henryiii
• @johnthagen
• @mayeut
• @patrick91
• @q0w
• @samypr100
• @scop
• @stasfilin
• @stefanv

New Features:

• Add uv backend by @henryiii in #762
• Add venv backend fallback by @henryiii in #787
• Add option --reuse-venv {yes,no,never,always} by @samypr100 in #730
• Add environment variable NOX_DEFAULT_VENV_BACKEND for default backend by @edgarrmondragon in #780
• Rename session.run_always to session.run_install by @henryiii in #770
• Add more option argument completions by @scop in #707
• Implement tox-to-nox for tox 4 by @frenzymadness in #687
• Allow --force-python on unparametrized sessions by @chrysle in #756
• Add include_outer_env parameter to session.run and friends by @franekmagiera in #652
• GitHub Action: Add support for the ~ version specifier by @mayeut in #712

Bugfixes:

• Rebuild environment when changing to an incompatible backend type by @henryiii in #781
• Warn user when first argument to session.run is a list by @stefanv in #786
• Allow overriding nox.options.sessions with --tags by @q0w in #684
• Allow overriding NO_COLOR with --force-color by @stasfilin in #723
• Fix nox.options.error_on_missing_interpreters when running in CI by @samypr100 in #725

Documentation Improvements:

• Create an official Nox badge by @johnthagen in #714 and #715
• Add recipe for generating a matrix with GitHub Actions by @henryiii in #696
• Update some links by @henryiii in #774

Internal Changes:

• fix: always pull versions from metadata by @henryiii in #782
• chore: ruff moved to astral-sh by @henryiii in #722
• Use double quotes instead of single in github actions examples by @patrick91 in #724
• tests: fixes when running locally by @henryiii in #721
• chore: modernize Ruff config, bump pre-commit by @henryiii in #744
• chore(deps): bump actions/checkout from 3 to 4 by @dependabot in #738
• chore: ruff-format by @henryiii in #745
• chore(action): update default python-versions by @mayeut in #767
• chore(ci): allow manual runs on branches without a PR by @mayeut in #766
• chore(ci): bump actions/setup-python & conda-incubator/setup-miniconda by @mayeut in #765
• ci: group dependabot updates by @henryiii in #755
• fix(types): improve typing by @henryiii in #720
• ci: fix coverage combine for different OS's by @henryiii in #778
• ci: update to artifacts v2 by @henryiii in #772
• ci: remove skipped job & combine (faster) by @henryiii in #771
• chore: cleanup Ruff a bit by @henryiii in #783
• chore(deps): bump the actions group with 2 updates by @dependabot in #784
• style: add type hints, update few functions by @stasfilin in #728
• Include Python 3.12 in GHA by @DiddiLeija in #743
• Allow tests to pass in environments where NO_COLOR=1 is set by @edgarrmondragon in #777
• tests: support running when the Python launcher for UNIX is present by @henryiii in #775
• chore: drop unneeded config option by @henryiii in #773
• Bump minimum virtualenv to 20.14.1 by @johnthagen in #747
• chore: save session name in Func by @MicaelJarniac in #718
• Removed the problematic Python 2.7.18 version by @stasfilin in #726
• Fixed Improper Method Call: Replaced NotImplementedError by @fazledyn-or in #749

2023.04.22

We'd like to thank the following folks who contributed to this release:

• @crwilcox
• @dcermak
• @edgarrmondragon
• @FollowTheProcess
• @henryiii
• @reaperhulk
• @scop

New Features:

• Add support for NOXPYTHON, NOXEXTRAPYTHON and NOXFORCEPYTHON by @edgarrmondragon in #688
• feat: --json --list-sessions by @henryiii in #665

Documentation Improvements:

• style: spelling and grammar fixes by @scop in #682
• Add invite link to the discord server to CONTRIBUTING.md by @dcermak in #679

Internal Changes:

• chore: update pre-commit hooks by @edgarrmondragon in #690
• chore: move to using Ruff by @henryiii in #691
• Fix assertion in GHA tests by @FollowTheProcess in #670
• ci: some minor fixes by @henryiii in #675
• Constrain tox to <4.0.0 and minor fixes by @FollowTheProcess in #677
• chore: long term fix for bugbear opinionated checks by @henryiii in #678
• chore: switch to hatchling by @henryiii in #659
• Don't run python 2.7 virtualenv tests for newer versions of virtualenv by @crwilcox in #702
• allow the use of argcomplete 3 by @reaperhulk in #700
• fix: enable list_sessions for session completion by @scop in #699
• chore: remove 3.6 tests, min version is 3.7 by @crwilcox in #703

Full Changelog: 2022.11.21...2023.04.22

2022.11.21 🦃

We'd like to thank the following folks who contributed to this release:

• @airtower-luna
• @DiddiLeija
• @FollowTheProcess
• @henryiii
• @hynek
• @Julian
• @nhtsai
• @paw-lu

New features:

• Include Python 3.11 classifier & testing (#655)

Improvements:

• Fixed a few typos (#661, #660)
• Drop dependency on py (#647)
• nox.session.run now accepts a pathlib.Path for the command (#649)
• Document nox.session.run's stdout and stderr arguments and add example of capturing output (#651)

Bugfixes:

• GitHub Action: replace deprecated set-output command (#668)
• GitHub Action: point docs to 2022.8.7 not latest (#664)
• Docs: fix argument passing in session.posargs example (#653)
• Include GitHub action helper in MANIFEST.in (#645)

Internal changes:

• GitHub Action: move to 3.11 final (#667)
• Cleanup Python 2 style code (#657)
• Update tools used in pre-commit (#646, #656)

2022.8.7 🧚

We'd like to thank the following folks who contributed to this release:

• @CN-M
• @crwilcox
• @DiddiLeija
• @edgarrmondragon
• @FollowTheProcess
• @hauntsaninja
• @henryiii
• @johnthagen
• @jwodder
• @ktbarrett
• @mayeut
• @meowmeowmeowcat
• @NickleDave
• @raddessi
• @zhanpon

Removals:

• Drop support for Python 3.6 (#526)
• Disable running session.install outside a venv (#580)

New features:

• Official Nox GitHub Action (#594, #606, #609, #620, #629, #637, #632, #633)
• Missing interpreters now error the session on CI by default (#567)
• Allow configurable child shutdown timeouts (#565)
• Add session tags (#627)
• Add short -N alias for --no-reuse-existing-virtualenvs (#639)
• Export session name in NOX_CURRENT_SESSION environment variable (#641)

Improvements:

• Add VENV_DIR to dev session in cookbook (#591)
• Fix typo in tutorial.rst (#586)
• Use consistent spelling for Nox in documentation (#581)
• Support descriptions in tox-to-nox (#575)
• Document that silent=True returns the command output (#578)
• Support argcomplete v2 (#564)

Bugfixes:

• Fix incorrect FileNotFoundError in load_nox_module (#571)

Internal changes:

• Update the classifiers, documentation, and more to point to the new Winterbloom location (#587)
• Support PEP 621 (pyproject.toml) (#616, #619)
• Configure language code to avoid warning on sphinx build (#626)
• Use latest GitHub action runners and include macOS (#613)
• Jazz up the README with some badges/logo etc. (#605, #614)
• Prefer type checking against Jinja2 (#610)
• Introduce GitHub issue forms (#600, #603, #608)
• Full strictness checking on mypy (#595, #596)
• Drop 99% coverage threshold flag for 3.10 in noxfile (#593)
• Create a requirements-dev.txt (#582)
• Use myst-parser for Markdown docs (#561)

2022.1.7 🥳

Claudio Jolowicz, Diego Ramirez, and Tom Fleet have become maintainers of Nox. We'd like to thank the following folks who contributed to this release:

• @brettcannon
• @cjolowicz
• @dhermes
• @DiddiLeija
• @FollowTheProcess
• @franekmagiera
• @henryiii
• @jugmac00
• @maciej-lech
• @nawatts
• @Tolker-KU

New features:

• Add mamba backend (#444, #448, #546, #551)
• Add session.debug to show debug-level messages (#489)
• Add cookbook page to the documentation (#483)
• Add support for the FORCE_COLOR environment variable (#524, #548)
• Allow using session.chdir() as a context manager (#543)
• Deprecate use of session.install() without a valid backend (#537)

Improvements:

• Test against Python 3.10 (#495, $502, #506)
• Add support for the channel option when using the conda backend (#522)
• Show more specific error message when the --keywords expression contains a syntax error (#493)
• Include reference to session.notify() in tutorial page (#500)
• Document how session.run() fails and how to handle failures (#533)
• Allow the list of sessions to be empty (#523)

Bugfixes:

• Fix broken temporary directory when using session.chdir() (#555, #556)
• Set the CONDA_PREFIX environment variable (#538)
• Fix bin directory for the conda backend on Windows (#535)

Internal changes:

• Replace deprecated load_module with exec_module (#498)
• Include tests with source distributions (#552)
• Add missing copyright notices (#509)
• Use the new ReadTheDocs configurations (#527)
• Bump the Python version used by ReadTheDocs to 3.8 (#496)
• Improve the Sphinx config file (#499)
• Update all linter versions (#528)
• Add pre-commit and new checks (#530, #539)
• Check MANIFEST.in during CI (#552)
• Remove redundant LICENSE from MANIFEST.in (#505)
• Make setuptools use the standard library's distutils to work around virtualenv bug. (#547, #549)
• Use shlex.join() when logging a command (#490)
• Use shutil.rmtree() over shelling out to rm -rf in noxfile (#519)
• Fix missing Python 3.9 CI session (#529)
• Unpin docs session and add --error-on-missing-interpreter to CI (#532)
• Enable color output from Nox, pytest, and pre-commit during CI (#542)
• Only run conda_tests session by default if user has conda installed (#521)
• Update dependencies in requirements-conda-test.txt (#536)

2021.10.1 🎃

New features:

• Add session.warn to output warnings (#482)
• Add a shared session cache directory (#476)
• Add session.invoked_from (#472)

Improvements:

• Conda logs now respect nox.options.verbose (#466)
• Add session.notify example to docs (#467)
• Add friendlier message if no noxfile.py is found (#463)
• Show the noxfile.py docstring when using nox -l (#459)
• Mention more projects that use Nox in the docs (#460)

Internal changes:

• Move configs into pyproject.toml or setup.cfg (flake8) (#484)
• Decouple test_session_completer from project level noxfile (#480)
• Run Flynt to convert str.format to f-strings (#464)
• Add python 3.10.0-rc2 to GitHub Actions (#475, #479)
• Simplify CI build (#461)
• Use PEP 517 build system, remove setup.py, use setup.cfg (#456, #457, #458)
• Upgrade to mypy 0.902 (#455)

Special thanks to our contributors:

• @henryiii
• @cjolowicz
• @FollowTheProcess
• @franekmagiera
• @DiddiLeija

2021.6.12

• Fix crash on Python 2 when reusing environments. (#450)
• Hide staleness check behind a feature flag. (#451)
• Group command-line options in --help message by function. (#442)
• Avoid polluting tests with a .nox directory. (#445)