{pkgs ? import {}}: let python = pkgs.python313.withPackages (ps: with ps; [ fastapi pydantic guessit aiohttp watchfiles langcodes asyncpg pyjwt python-slugify ]); in pkgs.mkShell { packages = with pkgs; [ python uv ruff fastapi-cli pgformatter ]; UV_PYTHON_PREFERENCE = "only-system"; UV_PYTHON = pkgs.python313; }