Install a single package from poetry.lock

[cprevosteau]

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Feature Request

Hi,
Thanks for this marvellous tool.

I often find myself wanting to install a single package from poetry.lock.
For instance, in my CI/CD pipeline I have a task to check my code against a linter.
And I would like to install the version of flake8 defined in the poetry.lock without installing the whole file.

Today the only way to get this version is to parse the result of the command poetry show flake8.

It would be nice to able to do so with a command like:

poetry install flake8

in order to only install flake8.

Or at least there is an option to the command poetry show to only return the version of the package. Something like:

$ poetry show flake8 --only-version
3.9.0

This way a simple pip install flake8==$(poetry show flake8 --only-version) will do the trick in my CI/CD task.

[finswimmer]

Hello @cprevosteau,

this was requested earlier in #3570. I've made a PR for it in #3623. But maybe it get superseded by the implementation for #1644.

fin swimmer

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