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?!
In this super specific case, the data that is being worked with is a many list of dict. A schema-less table. There would be frequent updates to this data. As package versions are upgraded, fixes are made, and security patches are added.
It’s not schemaless at all, it’s a dictionary of string to string. Not that complex.
The strictyaml schema holds a pinch of nuance.
The value argument is automagically coersed to a str. Which is nice; since the field value can be either integer or str. And i want a str, not an int.
A Rust solution would be superior, but the Python API is reasonable; not bad at all.
I’m not sure what you’re talking about. My point was that dependency definitions in pyproject.toml aren’t schemaless.
strict schema and a spec are not the same. package pyproject-validate can check if a pyproject.toml follows the spec, but not be using a strict schema.
A schema is similar to using Rust. Every element is strictly typed. Is that an int or a str is not enforced by a spec
If there was a strict schema, package pyproject-validate would be unnecessary
Wait. So there’s a tool that allows you to validate
pyproject.tomlfiles (since this file can be extended by any tool), and that somehow proves that dependency declarations inpyproject.tomlare schemaless? They literally use a JSON Schema for validating exactly this: https://validate-pyproject.readthedocs.io/en/latest/json-schemas.htmlIgnoring concurrency.
For a write to be transactional, validate-pyproject would need to be called:
Once prior to the read and again prior to the write.
Is that occurring always?
Haven’t checked if validate-pyproject has an API, so can be called on a str rather than only a file.
It seems you’re describing a lock file. No one is proposing to use or currently using pyproject.toml as a lock file. And even lock files have well defined schemas, not just an arbitrary JSON-like object.
then i’m misunderstanding what data
dependencies groupsare supposed to be storing. Just the equivalent of requirements.in files and mapping that to a target? And no-c(constraints) support?!Feels like tying one of hands behind our back.
see https://packaging.python.org/en/latest/specifications/dependency-groups/#dependency-groups
There’s a few edge cases on parsing dependency urls. So it’s not completely black and white.
just have to read over to pip-compile-multi to see that. (i have high praise for that project don’t get me wrong)