Allow users to install a project's dependencies, without the project itself

[charliermarsh]

Not sure if we want this -- it's like Poetry's --no-root. Let's wait and see if we can find motivating use-cases for it. Poetry also has this concept of "operating modes" which toggle this automatically.

[charliermarsh]

(Not decided, filed to revisit later.)

[zanieb]

Lots of prior chatter over in python-poetry/poetry#800

[kdebrab]

Maybe see also pypa/pip#11440 for potential use cases.

[charliermarsh]

(Interestingly, we actually kind of already support what's described in that issue because we allow pip install -r pyproject.toml. But that's separate from this issue.)

[kdebrab]

(Interestingly, we actually kind of already support what's described in that issue because we allow pip install -r pyproject.toml. But that's separate from this issue.)

That doesn't support the [extras] syntax (e.g. pip install -r pyproject.toml[doc])?

Personally, I'd love to see support for the syntax suggested here:

pip install --only-deps  .[doc]  # project.dependencies and project.optional-dependencies.doc

[EDIT]
Just discovered that pip install -r pyproject.toml --extra doc gives the functionality I was looking for. That's really great!

[firtrfl]

This works great pip install -r pyproject.toml :) It would be still great to add a flag and also add it to the pyproject.toml

[tool.uv]
package-mode = false

So it would also work with uv add <package>. Many things that I work on are not packages, but it would still be great to use uv to manage dependencies.

PS: uv is such an amazing tool - thanks for building it ❤️

[kdeldycke]

I have a use case for that: my blog, which is cirtually Markdown content only, and that is built by Pelican, a pure Python static website generator.

In that case the package-mode = false from Poetry was handy.

In the mean time, I hacked the process and added a dummy package at the root of my repository:

$ ls -lah ./blog
Permissions Size User Date Modified    Name
drwxr-xr-x     - kde  2024-07-13 14:12  .
drwxr-xr-x@    - kde  2024-07-13 14:17  ..
.rw-r--r--     0 kde  2024-07-13 14:11  __init__.py

And added the following directive in pyproject.toml:

[tool.setuptools.packages.find]
include = ["blog"]