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# Python Development

`pyproject.toml` is the source of truth for the Python target, tools, scripts, and dependencies. Check it, `.python-version`, and CI before using 3.12-only syntax. Project conventions win over these defaults.

## Toolchain

- uv for environments and commands (`uv run`, `uv add`); never call `pip` directly. Match the lockfile already in use.
- Ruff for lint and format. Pyright for types, or `ty` only when the project has adopted it.
- pytest for tests.

## Defaults

- Stdlib before packages: `argparse`, `dataclasses`, `pathlib`, `json`, `urllib`, `logging`. Do not add Rich, pydantic, or dotenv only for polish.
- 3.12+ typing: `X | Y`, builtin generics, PEP 695 generics and `type` aliases. Keep legacy `TypeVar` style when editing pre-3.12 modules.