(🎁) Support isolated dependencies that install like `pyprojectx`/`pipx`

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
tooling

Research direction

Start with the proposed pyproject.toml dependency and group declarations, then review the poetry install --without lint example. The request is complete when dependencies can be locked and installed in project-local isolated contexts without interfering with project dependencies, including the proposed group behavior.

Written by the indexing model from the issue text.

Description

kind/feature status/triage
  • I have searched the issues of this repo and believe that this is not a duplicate.
  • I have searched the documentation and believe that my question is not covered.

Feature Request

pseudo pyproject.toml:

[tool.poetry.group.dev.dependencies]
pytest = "6.0.0"
black = { version = "^21.12b0", isolated = true }

OR:

[tool.poetry.group.test.dependencies]
pytest = "6.0.0"
[tool.poetry.group.lint.dependencies]
black = { version = "^21.12b0", isolated = true }

I have dev dependencies that are never imported by my source code or my test code, they act more as standalone cli applications. I still want the version to be locked down, and provide a one click install for developers working with my project, but I don't want the possibility of that dependency interfering with dependency resolution or accidentally becoming imported due to it being in the pythonpath.

When declared with the optional isolated properties, I want Poetry to install the dependency like a pyprojectx context would, completely isolated from the other dependencies.

I would want it installed, isolated within the current project, but also isolated from the project dependencies.

Of course, to copy the functionality of pyprojectx, multiple dependencies could be specified into each context/group

[tool.poetry.group.list]
allisolated = true

[tool.poetry.group.lint.dependencies]
black = "^21.12b0"
flake8 = "^4.0.1"
isort = "^5.10.1"
pre-commit = "^2.16.0"
pylint = "^2.11.2"
pytest = "^7.0.0rc1"

[tool.poetry.group.lint-mypy]
isolated = true

[tool.poetry.group.lint-mypy.dependencies]
basedmypy = "^2.5.0"
types-docutils = "^0.17.4"
types-python-dateutil = "^2.8.6"
types-PyYAML = "^6.0.3"
types-requests = "^2.27.7"
types-setuptools = "^57.4.7"
types-urllib3 = "^1.26.4"

Ideally this exact scenario would benefit from some kind of sub-grouping feature such that poetry install --without lint would also not install basedmypy, but that's an extremely minor point IMO.

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