majesticlabs-dev 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