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ku5icku5ic/claude-kit/skills/python-patterns/SKILL.md

python-patterns

Skill2 starsChanged 7 days agoMITView on GitHub

Python language-level patterns for type hints, strictness, project layout, async, error handling, packaging, and review-worthy anti-patterns. Use whenever the project contains `.py` files or a Python manifest (`pyproject.toml`, `requirements.txt`, `Pipfile`, `uv.lock`, `poetry.lock`), OR the user asks about Python, its typing and type checkers, its async model, or its packaging and project structure, even if "Python" is not mentioned by name.

56 other projects use a version of this.

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Projects with it also use configure-ecc, nuxt4-patterns and 10 more.

Other files people use alongside this one.

Files found in the same public projects as a version of this one, more often than they turn up anywhere else. Each project counts once, large collections count for less, and this file's own repository is left out.
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The file

We split this skill into the rules it gives an agent

1 rule. 0 are common, 1 is distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 53 edited versions we read keep these.

  • 1

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

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

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Default assumption: Python 3.11 or later, type hints required on public function signatures, mypy or pyright in strict mode.

    line 8

“Common” is measured: kept by at least 6 in 10 of the 53 edited versions of this file we could read. “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

Python patterns

Default assumption: Python 3.11 or later, type hints required on public function signatures, mypy or pyright in strict mode.

  • 3.11 is the floor: TaskGroup, Self, StrEnum, and ExceptionGroup all landed there.
  • 3.14 (current stable since 2025-10-07, latest 3.14.7) made deferred annotation evaluation the default; on older supported versions, from __future__ import annotations is still useful for forward references.
  • Adapt advice to the version in the project's .tool-versions, pyproject.toml, or .python-version.

Reference files

FileCovers
reference/typing.mdType hints, strictness, mypy/pyright per-module overrides
reference/project-layout.mdsrc/ layout, pyproject.toml, packaging, py.typed (PEP 561), namespace packages (PEP 420)
reference/async.mdasync def hazards, TaskGroup, anyio cancellation scopes
reference/errors.mdException design, chaining, LBYL vs EAFP, logger.exception
reference/common-patterns.mdDataclasses, enums, pathlib, functools.cache, Pydantic v2 patterns
reference/anti-patterns.mdThirteen language anti-patterns, free-threaded build implications, testing-adjacent items

References

Version notes

Checked: 2026-09-26 against https://www.python.org/downloads/ and https://docs.python.org/3/whatsnew/

  • 3.15 (pre-release, planned 2026-10-01): typing additions PEP 747 TypeForm, PEP 728 TypedDict(closed=True, extra_items=...), PEP 800 disjoint bases. Not yet guidance here.
  • 3.14 (2025-10-07, latest 3.14.7 on 2026-08-05): deferred annotation evaluation by default (PEP 649); from __future__ import annotations on a deprecation path (PEP 749); free-threaded build officially supported (PEP 779), 5-10% single-threaded penalty, not the default build.
  • 3.13: free-threaded build experimental (PEP 703). Once 3.13 reaches EOL the floor here moves and the from __future__ paragraph can go.

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