> Wednesday, December 17, 2025

With uv it’s straightforward to try different python flavours, i.e., the free-threaded version introduced in 3.13 or the jit-compiled pypy with versions up to 3.11. Just run

uv python install 3.14t for the free-threaded version or uv python install pypy3.11 for the latest version of pypy.

Since astral has now officially announced the beta of ty, i’d like to share my current setup of amazing and fast tools:

• uv is for managing python dependencies and python itself. Rigorous environment locks included, which you absolutely need. Can also do versioning, building and publishing.
• pixi is for when you need to have conda dependencies. It uses uv under the hood for pypi deps, which is why I try to add everything as a pypi dependency (pixi add --pypi x).
• ruff is a linter. I don’t want to see any of you manually formatting code, inserting spaces and the like. Just use ruff.
• ty (now officially in beta) is a static type checker. It’ll tell you things like when you return or pass the wrong type, which will probably make your code malfunction. You can use it as a full language server, so it’ll also tell you diagnostics, give (non-AI) code completions for known symbols, and show docstrings.

All of these are built in rust and just generally nice to use.

Honorable mention to loguru for being a logger that I actually can remember how to use (from loguru import logger; logger.info('hello')).