Sure, we could add --all-groups throughout to match --all-extras

The --all-group command would be very helpful to install all groups with a single command.
Also it would be great to support multiple groups together within one --group argument like this uv sync --group "lint,docs" instead of uv sync --group lint --group docs

We probably won't support multiple groups in a single option, that doesn't match the design of the rest of our CLI.

Though it's not completely portable, you can use brace expansion in many Unix shells (Bash, Zsh, Ksh, Fish, etc.) to get the desired behavior because the --group groupname syntax may use an = as in --group=groupname. To show this using the echo command:

echo uv sync --group={lint,docs}

with output:

uv sync --group=lint --group=docs

Groups can also include each other, so you can add a group that includes all other groups, if you want to.

The PEP has the syntax for group inclusion here https://peps.python.org/pep-0735/#dependency-group-include

Just referencing here that I temporally solved this issue by defining default groups:

# pyproject.toml
[tool.uv]
default-groups = ["lint", "docs"]

This makes the uv sync command sync all groups contained there. This obviously has the disadvantage that now I need to specify --no-group or --only-group when I don't want any of those groups.

@zanieb In line with the above comment, I also can't find a way to only install the project-level dependencies (those under [project].dependencies), regardless of what the default groups property defines.

For example, Poetry achieves this behavior by using the --only main flag (although badly documented). This seems equivalent to the --only-group flag, with the caveat that the project-level dependencies don't seem to belong to a group.

My workaround for achieving both behaviors (sync with default groups and sync only main) is creating a main group.

Edit: This seems loosely related to #8582

@amoralesc it seems like we might want a --no-default-groups flag, which I was sort of hoping we could avoid (just because we have so many flags)