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