Ruff and mypy usage

[laguill]

Hello,
How do you integrate ruff and mypy in your project ?

Do you create dev feature ?
For now I added ruff and mypy directly in my project

For sharing or collaboration I am not sure that the "correct " way ...

What do you suggest do you have some exemple ?

Thanks for your help

[ruben-arts]

Hey @laguill,

A dev feature might be the best option indeed!

[project]
name = "project"
channels = ["https://prefix.dev/conda-forge"]
platforms = ["linux-64", "win-64", "osx-64", "osx-arm64"]

[feature.dev.dependencies]
ruff = "*"
mypy = "1.13"

[dependencies]
python = ">=3.12, <3.13"
matplotlib = "*"
numpy = "*"

[feature.test.dependencies]
pytest = "*"

[environments]
 # Extend the default environment with multiple features
default = { features = [ "dev", "test", ], solve-group = "default" }
# Have only the default dependencies and the added test dependencies.
test = { features = ["test"], solve-group = "default" }

Results in this pixi info:

....
Environments
------------
       Environment: default
          Features: dev, test, default
       Solve group: default
          Channels: https://prefix.dev/conda-forge
  Dependency count: 6
      Dependencies: ruff, mypy, pytest, python, matplotlib, numpy
  Target platforms: win-64, linux-64, osx-arm64, osx-64

       Environment: test
          Features: test, default
       Solve group: default
          Channels: https://prefix.dev/conda-forge
  Dependency count: 4
      Dependencies: pytest, python, matplotlib, numpy
  Target platforms: osx-64, win-64, osx-arm64, linux-64

Note that for pyproject.toml there is also dependency-groups which allow you to rewrite this same project in a pyproject.toml as:

[project]
name = "project"
requires-python = ">=3.12, <3.13"
dependencies = ["matplotlib", "numpy"]

[dependency-groups]
dev = ["ruff", "mypy==1.13"]
test = ["pytest"]

[tool.pixi.project]
channels = ["https://prefix.dev/conda-forge"]
platforms = ["linux-64", "win-64", "osx-64", "osx-arm64"]

[tool.pixi.environments]
 # Extend the default environment with multiple features
default = { features = [ "dev", "test", ], solve-group = "default" }
# Have only the default dependencies and the added test dependencies.
test = { features = ["test"], solve-group = "default" }

[laguill]

Something like that ?

# create project folder
mkdir ~/Documents/01-Etudes/OpenClassrooms/P2_Analyser-donnees-systemes-educatifs
cd !$
pixi init --format pyproject

# add dependencies
pixi add python jupyterlab ipykernel pixi-kernel pandas

# dev dependencies
pixi add --feature dev mypy ruff
# or using dependency-groups
pixi add --dependency-groups.dev mypy ruff

# create default env for the project
pixi install

# activate project environment
pixi shell

It is confusing to use feature or dependency-groups ?
When should you use it ?