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CassetteTapeCrackleCassetteTapeCrackle/claude-starters/skills/clean-code-python/SKILL.md

clean-code-python

Skill1 starsChanged 3 months agoMITView on GitHub

Use when writing or reviewing Python — deeper idioms (type hints, dataclasses/pydantic, no mutable defaults, EAFP, pathlib, context managers, comprehensions).

The file

We split this skill into the rules it gives an agent

2 rules. About 0 are common, 0 are distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Never mutable default args (def f(x=[])) — use None + assign inside.

    line 15
  2. Very specific:

    No bare except: — catch specific exceptions.

    line 17

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Clean-code Python (depth)

On top of the base rules (type hints, ruff, pytest).

Types & data

  • Explicit hints on public functions; from __future__ import annotations for forward refs. No bare Any.
  • Model records with @dataclass (or pydantic at boundaries); avoid dicts-as-objects for structured data.

Footguns

  • Never mutable default args (def f(x=[])) — use None + assign inside.
  • EAFP over LBYL: try/except around the operation rather than pre-checking, but keep try bodies small.
  • No bare except: — catch specific exceptions; re-raise with context.

Idioms

  • pathlib.Path over os.path string surgery. Context managers (with) for files/locks/resources.
  • Comprehensions/generators over manual accumulation loops; generators for large/streamed data.
  • f-strings for formatting; logging not print for diagnostics.

Smells

  • A function taking/returning big untyped dicts → dataclass.
  • except Exception: pass → swallows bugs.
  • Manual file open/close without with → leak on error.

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