[Question] How should one install dev dependencies declared in pyproject.toml [dependency-groups]

[TonyYanOnFire]

Hi.

I'm trying to introduce uv into my project. I did the following things to simulate the scenario of installing development dependencies when other members switch to using uv:

1. uv add --dev pycowsay
2. uv pip uninstall pycowsay
   At this point, pyproject.toml has:

[dependency-groups]
dev = [
"pycowsay>=0.0.0.1",
]

But pycowsay is not installed in the environment, just like what other members may encounter.
At this time, if you run uv pip install -r pyproject.toml, pycowsay will not be installed.
Trying to add --extra dev results in an error:

$ uv pip install -r pyproject.toml --extra dev
error: Requested extra not found: dev

How can I achieve my goal? Or am I trying to solve the wrong problem?

[charliermarsh]

We don't support dependency groups in the uv pip interface right now. We've been waiting on pip itself so that we can align on a similar CLI. Dependency groups are only supported in uv sync, uv lock, etc.

In your case, you want uv sync --dev.

[charliermarsh]

See also: #8590