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Run npx skillmds@latest add rocketpy-team/python-conventions-2 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Python Conventions free to use?

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Who published Python Conventions?

rocketpy-team (@rocketpy-team) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Python Conventions by rocketpy-team

Name: Python Conventions
Author: rocketpy-team

Python Conventions

Python style, tooling, and testing conventions for this repo — ruff/black formatting, pylint config, NumPy docstrings, logging, and the pytest layout (unit/integration/acceptance) with the single-JVM constraint. Use before writing or reviewing any Python change here so it passes CI on the first try.

rocketpy-team Updated Sep 21, 2026

File contents

Python conventions

Formatting & linting (must pass CI)

ruff is the formatter and primary linter. Line length 88, black-compatible.
- Format: make format = ruff check --select I --fix (import sort) + ruff format .
- Lint: make ruff-lint = ruff check .
pylint also runs: make pylint = pylint examples/ rocketserializer/ tests/. The disabled checks are in pyproject.toml [tool.pylint] (e.g. missing docstrings, too-many-locals/arguments, raise-missing-from, fixme). Don't re-enable them ad hoc.
CI (.github/workflows/linter.yml) runs ruff format --check, ruff check, and pylint on Python 3.9. Run make lint locally first.
Supported Python: 3.8–3.12 (requires-python = ">= 3.8"). Don't use syntax newer than 3.8.

Docstrings & logging

NumPy-style docstrings with Parameters / Returns / Raises sections — match the existing modules (_helpers.py, ork_extractor.py).
Every module defines logger = logging.getLogger(__name__). Log instead of print. User-facing CLI messages are prefixed with the command name, e.g. [ork2json] ....
Public functions raise precise exceptions with actionable messages (FileNotFoundError, ValueError); the CLI surfaces them.

Testing

Layout: tests/unit/, tests/integration/, tests/acceptance/.
Run: make tests (pytest); CI: pytest tests/ -v --timeout=120 (the --timeout guards against a hung JVM). One case: pytest tests/acceptance/test_ork_extractor.py -k valetudo -v.
Single-JVM rule: JPype (<1.5) can't restart a JVM in-process, so tests/conftest.py opens exactly one OpenRocketSession and caches every example's settings as fixtures. Never open another session in a test.
Acceptance tests are golden-file comparisons against examples/<name>/parameters.json. Intentional output changes require regenerating and reviewing those files.

Dependencies

Runtime deps are in requirements.in (consumed by pyproject.toml dynamic dependencies); dev tools in requirements-dev.txt. Add runtime deps to requirements.in, not directly to pyproject.toml.

---name: python-conventions-2description: Python style, tooling, and testing conventions for this repo — ruff/black formatting, pylint config, NumPy docstrings, logging, and the pytest layout (unit/integration/acceptance) with the single-JVM constraint. Use before writing or reviewing any Python change here so it passes CI on the first try.---# Python conventions## Formatting & linting (must pass CI)- **ruff** is the formatter and primary linter. Line length **88**, black-compatible. - Format: `make format` = `ruff check --select I --fix` (import sort) + `ruff format .` - Lint: `make ruff-lint` = `ruff check .`- **pylint** also runs: `make pylint` = `pylint examples/ rocketserializer/ tests/`. The disabled checks are in `pyproject.toml` `[tool.pylint]` (e.g. missing docstrings, too-many-locals/arguments, `raise-missing-from`, `fixme`). Don't re-enable them ad hoc.- CI (`.github/workflows/linter.yml`) runs `ruff format --check`, `ruff check`, and pylint on Python 3.9. Run `make lint` locally first.- Supported Python: 3.8–3.12 (`requires-python = ">= 3.8"`). Don't use syntax newer than 3.8.## Docstrings & logging- **NumPy-style docstrings** with `Parameters` / `Returns` / `Raises` sections — match the existing modules (`_helpers.py`, `ork_extractor.py`).- Every module defines `logger = logging.getLogger(__name__)`. Log instead of `print`. User-facing CLI messages are prefixed with the command name, e.g. `[ork2json] ...`.- Public functions raise precise exceptions with actionable messages (`FileNotFoundError`, `ValueError`); the CLI surfaces them.## Testing- Layout: `tests/unit/`, `tests/integration/`, `tests/acceptance/`.- Run: `make tests` (`pytest`); CI: `pytest tests/ -v --timeout=120` (the `--timeout` guards against a hung JVM). One case: `pytest tests/acceptance/test_ork_extractor.py -k valetudo -v`.- **Single-JVM rule:** JPype (`<1.5`) can't restart a JVM in-process, so `tests/conftest.py` opens exactly one `OpenRocketSession` and caches every example's settings as fixtures. Never open another session in a test.- **Acceptance tests are golden-file comparisons** against `examples/<name>/parameters.json`. Intentional output changes require regenerating and reviewing those files.## DependenciesRuntime deps are in `requirements.in` (consumed by `pyproject.toml` dynamic dependencies);dev tools in `requirements-dev.txt`. Add runtime deps to `requirements.in`, not directly to`pyproject.toml`.

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