Install just dependencies from pyproject.toml like from requirements with -r

What’s the problem this feature will solve?

Python encourage user to put all project infomation into one file: pyproject.toml , including dependencies.

But currently, users who want to just install dependencies and run a project, I mean not install it into site-packages, could not do this just with pip.

People have to use pip-tools generate requirements.txt first.

Describe the solution you’d like

pip install -r pyproject.toml

Alternative Solutions

$ pip install pip-tools
$ python -m piptools compile \
    -o requirements.txt \
    pyproject.toml
$ pip install -r requirements.txt 

Additional context

No

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[pfmoore]

I don’t think that installing dependencies and running a project uninstalled is a pattern we want to encourage. If you’re running your project uninstalled, it’s probably an application, not a library, and applications should be using a requirements file. See https://caremad.io/posts/2013/07/setup-vs-requirement/

[uranusjr]

See discussions in #4783. The final comment mentioned container image layers, which I think is a use case that’s more relevant now than back then. I still believe this belongs to workflow tools (e.g. pip-tools, poetry, pdm) instead of pip, however.