Install `poetry` groups with `pip`

howto_install_poetry_groups_with_pip.md

Sometimes, you need to install poetry groups (for docs, test, or dev) but you want to use pip.

Here's how to do it.

First, install the poetry-plugin (see original link):

$ $POETRY_HOME/bin/pip install --user poetry-plugin

Then, for a group [tool.poetry.group.docs.dependencies], run

$ poetry export -f requirements.txt --without-hashes --only docs -o only-docs.txt
$ pip install -r only-docs.txt

Ref: https://stackoverflow.com/a/77043526