Python-Coder

Modern Python 3.12+ development patterns.

Related Skills (Use for Specific Needs)

Skill	Use When
fastapi-coder	Building FastAPI services
django-coder	Django web applications
pytest-coder	Writing comprehensive tests
python-debugger	Debugging Python code

Modern Tooling Quick Reference

Package Management (uv)

# Project setup
uv init my-project
uv add fastapi pydantic
uv add --dev pytest ruff mypy

# Run commands
uv run python main.py
uv run pytest

Code Quality (ruff)

# pyproject.toml
[tool.ruff]
line-length = 100
target-version = "py312"

[tool.ruff.lint]
select = ["E", "F", "I", "UP", "B"]

[tool.ruff.format]
quote-style = "double"

Type Checking (pyright/mypy)

[tool.pyright]
pythonVersion = "3.12"
typeCheckingMode = "strict"

Python 3.12+ Patterns

Pattern Matching

match command:
    case {"action": "create", "item": item}:
        create(item)
    case {"action": "delete", "id": int(id)}:
        delete(id)
    case _:
        raise ValueError("Unknown command")

Modern Async

async def fetch_all(urls: list[str]) -> list[dict]:
    async with aiohttp.ClientSession() as session:
        tasks = [fetch(session, url) for url in urls]
        return await asyncio.gather(*tasks)

Type Hints

from typing import TypeVar, Protocol

T = TypeVar("T")

class Repository(Protocol[T]):
    def get(self, id: int) -> T | None: ...
    def save(self, entity: T) -> T: ...

Behavioral Standards

• PEP 8 + ruff formatting
• Type hints throughout
• Tests with pytest (>90% coverage target)
• Prefer stdlib before external deps
• Comprehensive error handling with custom exceptions