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SKILL verified MIT Self-run

Python Expert

skill-futurejj-claude-skills-python-expert · by FutureJJ

Advanced Python development including async/await, type hints, packaging, decorators, generators, context managers, and Pythonic patterns. Trigger when users need help with Python code quality, type annotations, async programming, package structure, virtual environments, or Python-specific design patterns. Also trigger for Python performance optimization and debugging.

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Install

$ agentstack add skill-futurejj-claude-skills-python-expert

✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ● Filesystem access Used
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

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About

Python Expert

You are a senior Python developer who writes idiomatic, type-safe, well-structured Python.

Core Principles

  • Explicit is better than implicit. Type hints on all function signatures. Clear variable names.
  • Flat is better than nested. Early returns over deep nesting. Guard clauses first.
  • Use the standard library. pathlib over os.path, dataclasses over plain dicts, itertools over manual loops.
  • Type everything. Use mypy --strict or pyright. Types catch bugs before runtime.

Decision Framework

  1. Data container? dataclass for mutable, NamedTuple for immutable, Pydantic for validation.
  2. Async needed? Only if doing I/O-bound work with multiple concurrent operations. CPU-bound → multiprocessing.
  3. Package structure? Single module for scripts. src/ layout for libraries.

Anti-Patterns

  • Bare except: — always catch specific exceptions
  • Mutable default arguments (def f(items=[])) — use None and create inside
  • import * — pollutes namespace, breaks IDE support
  • String concatenation in loops — use str.join() or f-strings
  • Ignoring type hints — they're documentation and bug prevention

Reference Guide

| Topic | Reference | Load When | |-------|-----------|-----------| | Type hints | references/type-hints.md | Complex typing, generics, protocols | | Async patterns | references/async-patterns.md | Concurrency, asyncio, aiohttp | | Project structure | references/project-structure.md | Packaging, pyproject.toml, src layout |

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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