Python: Support PEP 735 `[dependency-groups]` in `pyproject.toml`

[vrslev]

Is there an existing issue for this?

• I have searched the existing issues

Feature description

uv recently released new version that supports now standardized [dependency-groups] table. See uv 0.4.27 and PEP 735.

[KyeRussell]

Additional context to hopefully nudge this one along: this is a dependency declaration standard being used right now by at least one Python package / project manager with a significant userbase (uv via uv add --dev ...). Parsing this is essentially the same as parsing [project.optional-dependencies], which dependabot can already handle. It's be great to see this included!

[dpgraham4401]

It's also used by PDM. Our team encountered error from dependabot if there were multiple groups listed under the dependency-groups section.

Dependabot can't parse your pyproject.toml
Dependabot failed to update your dependencies because there was an error parsing the pyproject.toml found at /pyproject.toml.

Dependabot encountered the following error:

/pyproject.toml not parseable

The logs do not include additional information about the parsing error. We were able to troubleshoot by placing all dependency-groups into one dev group.

EDIT: after placing all development dependencies into one dev group under the [dependency-groups], dependabot stopped erroring but actually didn't successfully start creating PRs. We ended up moving to the uv pip interface and optional-dependencies for the time being.

[evanbernstein]

I really hope that Dependabot is updated to support dev dependencies for modern python tooling. My codebases currently use two package managers, one for dependabot and the real one, which I have to update manually when dependabot pings us to update the old one. It is gross. I'm so glad that the python community is landing on a standard, and I hope it gets implemented soon!

[AA-Turner]

The pip project has just merged support for the PEP 735 [dependency-groups] table (pypa/pip#13065), which will likely be released in April.