nox for Rye (it works, sort of)

noxfile.py

import nox
import os
from pathlib import Path


PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12"]
VENV_BACKEND = "uv"

def ensurepath():
    rye_home = os.getenv("RYE_HOME")
    rye_py = Path(rye_home) if rye_home else Path.home() / ".rye" / "py"

    for py_dir in rye_py.iterdir():
        bin_dir = py_dir / "bin"
        os.environ["PATH"] = f"{bin_dir}:{os.environ['PATH']}"


ensurepath()


@nox.session()
def fetch(session: nox.Session):
    for require_version in PYTHON_VERSIONS:
        session.run("rye", "fetch", require_version, external=True)

    ensurepath()


@nox.session(python=PYTHON_VERSIONS, venv_backend=VENV_BACKEND)
def tests(session: nox.Session):
    session.install("-r", "requirements-dev.lock")
    session.run("pytest")


@nox.session(venv_backend=VENV_BACKEND)
def lint(session: nox.Session):
    session.install("-r", "requirements-dev.lock")
    session.run("ruff", "check")

@vincentchov There were a few missing prerequisites for this snippet to function correctly. You'll need to add a few dependencies:

$ rye add --dev pytest nox uv ruff

With these dependencies installed, the snippet should work as expected.

However, nowadays, using uv>=0.4 directly is a better approach than relying on this specific snippet.