# Modern Python > Use when writing, reviewing, or refactoring Python to ensure adherence to modern best practices (type syntax, `uv` instead of `python`, linting, formatting, etc.) - Skill: `tomevault-io/modern-python-3` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/modern-python-3` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/modern-python-3/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/modern-python-3 --- - Never use `python`. Use `uv` instead of `python` - `uv add package-name` - `uv run script.py` - Don't use `from __future__ import annotations` - Use modern type syntax (`list[str], str | None`) - Format with `uvx ruff format .` - Lint with `uvx ruff check .` and `uvx ty check` - Look before you leap (check conditions before acting) - Don't keep backwards compatibility - Declare variables close to use --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/davidgasquez) — claim your Tome and manage your conversions.