Add --extra-index-url option to pyproject.toml to install requirements.txt

[sglbl]

What's the problem this feature will solve?

My requirements.txt file:

fastapi==0.109.0
torch==2.3.1+cpu

I am trying to switch to pyproject.toml as suggested so that I don't have to use setup.py, setup.cfg and pip.conf. But at the same time I still want to use the simlicity of pip freeze to requirements.txt file so I don't have to add dependencies by hand in pyproject.toml and I will not have to use poetry like package.

[project]
name = "sg-project"
version = "0.1"
dynamic = ["dependencies"]

[tool.setuptools.dynamic]
dependencies = {file = ["requirements.txt"]}

Running it with:
pip install -e .

Describe the solution you'd like

dependencies = {file = ["requirements.txt"]} works if I didn't have torch+cpu but now it doesn't work.

I would like the solution to be one of these or something that I will not use other files like pip.conf

1. When I want to add extra-index-url to the requirements.txt it doesn't work anymore.
2. I tried to add it to dependencies like this and it didn't work:

dependencies = [
    "torch==2.3.1+cpu @ https://download.pytorch.org/whl/cpu"
]

3. Another solution that might be helpful

[tool.setuptools.dynamic]
dependencies = {file = ["requirements.txt"], extra-index-url = ["https://download.pytorch.org/whl/cpu"]}

Alternative Solutions

I know creating pip.conf and moving the filled file inside the virtual environment works but it would be better without needing this.

Additional context

No

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[notatallshaw]

Everything outside the [tool.*] section of a pyproject.toml is defined by standards, and pip follows those standards, to add something new you start a discussion for a new standard, that discussion is done on the Python discuss board: https://discuss.python.org/c/packaging/14

Pip configuration is all currently read out of pip.[conf|ini] files, if pip were to read pip specific configuration out of a pyproject.toml it must be done from a section [tool.pip]. I have not seen any proposal that pip should start reading configuration out of pyroject.toml, I agree it would be a quality of life improvement for many users, but there would also be a lot of design choices to make and it would be a non-trivial project. I imagine someone would really need to step up in terms of providing resources for that project.

[notatallshaw]

Btw, there was some discussion on this topic here: https://discuss.python.org/t/how-to-specify-extra-index-in-a-pyproject-toml-for-pip-and-pip-tools/23592, and somewhat related: https://discuss.python.org/t/another-idea-for-additional-package-repositories/66669

[notatallshaw]

I've created a dedicated issue for reading pip configuration out of pyproject.toml: #13003

As mentioned, making index urls a standard part of pyproject.toml would need to be discussed on: https://discuss.python.org/c/packaging/14

[sglbl]

I've created a dedicated issue for reading pip configuration out of pyproject.toml: #13003

As mentioned, making index urls a standard part of pyproject.toml would need to be discussed on: https://discuss.python.org/c/packaging/14

Thank you for creating a dedicated issue for reading pip configuration out of pyproject.toml