modern-python

name: modern-python description: Apply Trail of Bits “modern python” conventions (uv, ruff, ty, pytest, prek, pyproject.toml-first). Use when editing/adding Python code in this repo or when the user asks to modernize Python tooling. Avoid reformatting vendored Python under lib/** unless explicitly requested.

Modern Python (Trail of Bits style)

Based on the Trail of Bits modern-python plugin patterns (uv + ruff + ty + pytest + prek) described in their README: https://raw.githubusercontent.com/trailofbits/skills/main/plugins/modern-python/README.md.

Scope rules for this repo

• Do apply to first-party Python files (project code, scripts, tooling).
• Do NOT apply to vendored/third-party Python under lib/** (and other vendor dirs like node_modules/**) unless the user explicitly asks. If asked, keep changes minimal and avoid sweeping formatting.

Defaults (recommended)

• Python: require 3.11+
• Dependency management: uv (uv sync, uv add, uv run)
• Lint/format: ruff (format + lint)
• Type checking: ty (fast type checker) if acceptable; otherwise mypy/pyright only if user asks
• Tests: pytest (+ coverage gate if project is test-heavy)
• Hooks: prek (or pre-commit if already in use)
• Config: prefer pyproject.toml as the single source of truth

Command translation (legacy → modern)

• python … → uv run python … (or uv run … for scripts)
• pip install X → uv add X (project dep) or uv run --with X … (one-off)
• pip uninstall X → uv remove X
• pip freeze → uv export

When creating or modernizing a Python package

1. Detect existing tooling: check for pyproject.toml, requirements*.txt, setup.cfg, tox.ini, .pre-commit-config.yaml and decide whether to migrate or keep compatible.
2. Add/standardize pyproject.toml:
   • add tool configs for ruff (format + lint) and pytest
   • keep settings minimal and consistent (no redundant formatters)
3. Use src/ layout for importable packages when appropriate.
4. Add CI hooks only when requested (don’t spam checks).

When reviewing Python changes

• Prefer small diffs: functional changes separate from formatting/tooling changes.
• If introducing new tools, ensure they’re runnable with simple commands (uv run …, uv sync).
• Avoid pinning excessive versions unless the repo already pins; keep constraints compatible.