python-conventionslisted

# Python conventions Modern Python (3.11+) defaults. ## Types - Type hints required everywhere - `from __future__ import annotations` at top - Pydantic v2 for I/O, TypedDict for internal, Literal for string enums ## Stdlib - pathlib.Path over os.path - dataclasses over manual __init__ - subprocess.run over os.system - f-strings except logging - match for tagged unions ## Async - async def end-to-end, httpx not requests - TaskGroup for structured concurrency - Never time.sleep in async ## Logging - structlog or stdlib + structured extras - No print() in libraries - Lazy formatting ## Tooling - ruff for lint + format - mypy --strict - pytest fixtures - uv over pip ## Banned - Bare except - Mutable defaults - `from foo import *` - eval/exec on user input - Stringly-typed returns --- Full content + 15 worked examples at https://github.com/HermeticOrmus/python-conventions-skills.