# Python Development

> Develop Python projects using uv, Ruff and pytest.

- Skill: `felinics/python-development` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add felinics/python-development`
- Raw SKILL.md: https://api.skillmd.com/api/skills/felinics/python-development/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: felinics (https://skillmd.com/u/felinics)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/felinics/python-development

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# Python Development

## Respect the project
Inspect `pyproject.toml`, `uv.lock`, requirements files, Python version constraints and repository instructions. Work in a project virtual environment. The App provides Python, uv, Ruff and pytest as a fallback; prefer project-pinned versions when present.

## Install and verify
For a uv project, run `uv sync --locked` and use `uv run pytest`, `uv run ruff check` and `uv run ruff format --check`. For a requirements project, create `.venv` with `uv venv`, then `uv pip install -r requirements.txt`. Avoid modifying the shared interpreter or using system pip.

## Tests
Run the relevant tests after changes and report actual failures. Do not replace application dependencies with tools from the App's private development environment. Use `uv run` so tests import the project's dependencies.

References: https://docs.astral.sh/uv/ ; https://docs.astral.sh/ruff/ ; https://docs.pytest.org/