this post was submitted on 17 Jan 2025
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PEP 735 does dependency group solve anything? (peps.python.org)
submitted 2 weeks ago by logging_strict to c/python
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PEP 735 what is it's goal? Does it solve our dependency hell issue?

A deep dive and out comes this limitation

The mutual compatibility of Dependency Groups is not guaranteed.

-- https://peps.python.org/pep-0735/#lockfile-generation

Huh?! Why not?

mutual compatibility or go pound sand!

pip install -r requirements/dev.lock
pip install -r requirements/kit.lock -r requirements/manage.lock

The above code, purposefully, does not afford pip a fighting chance. If there are incompatibilities, it'll come out when trying randomized combinations.

Without a means to test for and guarantee mutual compatibility, end users will always find themselves in dependency hell.

Any combination of requirement files (or dependency groups), intended for the same venv, MUST always work!

What if this is scaled further, instead of one package, a chain of packages?!

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[–] [email protected] 3 points 2 weeks ago* (last edited 2 weeks ago) (24 children)

additional layer to abstract away from pip

reqs.txt files are not standardized and pip can read from a pyproject.toml - which is - using pip install .

there are still many unresolved matters with dependency resolution, but we need to leave requirements.txt files behind.

[–] logging_strict 1 points 2 weeks ago (23 children)

Throwing out an alternative. Not making the assumption that more TOML is better. Cuz the contents of those requirements.txt files are rw, not ro. I see pyproject.toml as a ro configuration file.

Do you agree or should pyproject.toml be rw?

Another option, strictly validated YAML.

For the configuration section, before parsing occurs, strict validation occurs against a schema.

TOML vs strictyaml -- https://hitchdev.com/strictyaml/why-not/toml/

[–] [email protected] 2 points 2 weeks ago (22 children)

I didn't know about StrictYAML, we're really going in circles lol

TOML is already RW by Poetry, PDM, and uv.

[–] logging_strict 1 points 1 week ago* (last edited 1 week ago)

Highly suggest reading the strictyaml docs

The author lays out both

Should be required reading for anyone dealing with config files, especially those encountering yaml.

Warning: After reading these, and confirming the examples yourself, seeing packages using pyyaml will come off as lessor

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