"For years I used tox and nox to test my Python projects against multiple Python versions on multiple operating systems. While both tools are powerful, they require configuration complex enough that I usually just copy/paste it from project to project. In comparison, `uv+just` isn't just a completely workable replacement, it's simple enough that I can either memorize the commands or if I forget can look up in moments. An improvement on [this post](https://daniel.feldroy.com/posts/2025-07-uv-run-for-testing-python-versions), which just covers the `uv` side."
"What is Just? [Just](https://github.com/casey/just) is a rust-powered command runner inspired by [Make](https://en.wikipedia.org/wiki/Make_(software)) but with a slightly simpler syntax. Where Make was originally designed to build executable code, just focuses more on being a command-runner. Also, `Just` benefits from the lessons learned by Make. The result is an easier-to-use tool that is also much easier to get running on Windows than `Make`. The way `Just` works is you define commands in a `Justfile` that can be easily executed from the command line."
Replace tox and nox with uv and just to test Python projects across multiple Python versions while keeping configuration simple and reducing external dependencies. uv+just offers a workable replacement with commands simple enough to memorize or quickly lookup. Just is a Rust-powered command runner inspired by Make, with a simpler syntax and better Windows support. Commands are declared in a Justfile and executed from the command line. Add rust-just to the development dependency group and pytest to the test group in pyproject.toml. Assume pytest is used, tests/ contains test cases, and compatibility with Python 3.13 and 3.14 is required.
Read at https://daniel.feldroy.com
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