python

# Python Development Skill

Comprehensive guide to modern Python development covering conventions, testing, tooling, security, performance, and ecosystem best practices (2024-2025 standards).

## Tier 2 Quick Start

**For multi-file projects, team collaboration, and maintained code:**

```bash
# Install Python 3.12 and uv (see Installation guides)
# Windows: winget install Python.Python.3.12 && winget install astral-sh.uv
# macOS: brew install python@3.13 uv
# Linux: apt install python3.13 && curl -LsSf https://astral.sh/uv/install.sh | sh

# Create new project with modern structure
uv init my-project
cd my-project

# Add dependencies
uv add requests httpx pydantic

# Add development dependencies
uv add --dev pytest pytest-cov ruff mypy

# Set up code quality (create pyproject.toml config - see assets/pyproject-toml-template.toml)
# Configure Ruff, mypy, pytest

# Write tests (pytest)
# tests/test_example.py - mirror src/ structure

# Run quality checks
uv run ruff check .          # Linting
uv run ruff format .         # Formatting
uv run mypy .                # Type checking
uv run pytest                # Run tests
uv run pytest --cov          # With coverage
```

## When to Use This Skill

Invoke this skill when you need guidance on:

- **Installation & Setup**: Installing Python 3.12/3.14, uv, setting up development environment
- **Code Style**: Following PEP-8, configuring Ruff/Black, naming conventions
- **Project Structure**: Organizing code with src/ layout, imports, package structure
- **Dependency Management**: Using uv, Poetry, pip, virtual environments, pyproject.toml
- **Testing**: Writing pytest tests, fixtures, parametrization, coverage, mocking
- **Type Hints**: Modern typing patterns, mypy configuration, protocols, generics
- **Code Quality**: Setting up Ruff, mypy, Bandit, pre-commit hooks, CI/CD
- **Async Programming**: asyncio patterns, async/await, TaskGroup, structured concurrency
- **Security**: OWASP best practices, input validation, dependen