Add ability to specify a set of dev dependencies to install toghether with all regular dependencies

[fredrikaverpil]

• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] I have searched the documentation and believe that my question is not covered.

Feature Request

I use poetry together with nox or tox. I then run multiple nox or tox sessions in CI, all of them starting with a poetry install. This installation takes up a lot of time, as this will install ~100 packages on my end.

I could look into venv caching, but I would rather start fresh each time and install my package and then a selection packages relevant to my nox or tox session.

I would've wanted to take the approach seen in the Hypermodern Python setup, where you can install one ore more dependencies (and its sub-dependencies) only, and constrain all versions to poetry's lockfile.

So, imagine something like;

$ poetry install --no-dev flake8 mypy pytest

The above would then install my package and its production requirements. But it would also install flake8, mypy and pytest, all constrained to the versions stipulated by poetry.lock.

However, if I want to do this today, I would need to define flake8, mypy and pytest twice in my pyproject.toml file, both as extras/opional under dependencies and again under dev-dependencies.

It would be nice to instead simply be able to pick dev-dependencies already specified.

[finswimmer]

Hello @fredrikaverpil,

your feature request sounds similar to https://github.com/python-poetry/poetry/issues/1644, is it?

fin swimmer

[fredrikaverpil]

Oh, indeed it is. I will close this issue in favor for #1644

Thanks for letting me know!

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