✨ feat(runner): add PEP 723 inline script metadata support#3912
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gaborbernat merged 2 commits intotox-dev:mainfrom Mar 30, 2026
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✨ feat(runner): add PEP 723 inline script metadata support#3912gaborbernat merged 2 commits intotox-dev:mainfrom
gaborbernat merged 2 commits intotox-dev:mainfrom
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PEP 723 lets scripts declare dependencies and Python version inline. The new virtualenv-pep-723 runner reads this metadata so environments need only a runner and script key — no deps/base_python duplication. The shared logic lives in Pep723Mixin (tox.tox_env.python.pep723) so third-party plugins like tox-uv can compose it with their own venv backend without duplicating code. The concrete runner composes the mixin with VirtualEnv and RunToxEnv, skipping PythonRun entirely so config keys like deps/extras/pylock are structurally absent. Closes tox-dev#3897
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tox-uv will also need an update to use it there? |
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Yes. |
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Closes #3897.
PEP 723 lets Python scripts declare their dependencies and required Python version inline via comment blocks. Currently tox users must duplicate this information in their tox config, which drifts out of sync and defeats the purpose of the standard. The new
virtualenv-pep-723runner reads metadata directly from the script file, so a tox environment needs only arunnerandscriptkey.The shared PEP 723 logic lives in
Pep723Mixinattox.tox_env.python.pep723, independent of any venv backend. The concretePep723Runnercomposes the mixin withVirtualEnvandRunToxEnv, skippingPythonRunentirely so config keys likedeps,extras,dependency_groups, andpylockare structurally absent rather than registered and rejected. Packaging is unconditionally disabled via_register_package_confreturningFalse. Settingbase_pythonexplicitly is rejected to prevent conflicts with the script'srequires-pythonspecifier.The mixin design means tox-uv can add PEP 723 support by composing
Pep723MixinwithUvVenvandRunToxEnv— zero code duplication.