python

Python 3.10+ Expert Skill

Trigger On

• The user asks to write, debug, review, or refactor Python code.
• Working in a repository containing *.py, pyproject.toml, requirements.txt, Pipfile, or poetry.lock.
• Requires asynchronous programming (asyncio), type hinting, or modern Python feature recommendations.
• The project needs setup for testing frameworks (pytest) or static analysis tools (ruff, mypy).

Workflow

1. Perceive:
   • Inspect the project root to identify package management tools: pyproject.toml (Poetry/PDM/Ruff), requirements.txt (pip), or environment.yml (Conda).
   • Probe for Python version requirements (ensure compatibility with 3.10+ minimum).
   • Identify the application type: Web API (FastAPI, Flask, Django), Data Science (Pandas, PyTorch), or CLI tools.
2. Reason:
   • Evaluate if the current code follows modern Python (3.10+) idioms (e.g., match/case, | union types).
   • Decide if type checking (MyPy/Pyright) or auto-formatting (Ruff/Black) needs to be introduced.
   • Recommend appropriate architectural patterns based on project scale.
3. Act:
   • Write Python code with complete Type Hints, prioritizing the X | Y syntax.
   • Prefer modern language features: match statements (3.10+), TaskGroup (3.11+), and new generic syntax (3.12+).
   • Ensure code passes static analysis and unit tests.

Coding Standards

• Type Hinting: Strongly recommended for all function signatures. Use 3.10+ union syntax like list[int | str].
• PEP 8 Compliance: Follow official style guidelines. Recommended to use ruff as a linter and formatter for consistency.
• Async Processing: Use 3.11+ asyncio.TaskGroup to manage concurrent tasks.
• Error Handling: Use specific exception types and leverage 3.11+ ExceptionGroup and except* syntax.

Tooling Recommendations

• Linter / Formatter: ruff (high performance and highly integrated).
• Type Checker: mypy or pyright.
• Testing: pytest with pytest-asyncio or pytest-cov.
• Package Management: Poetry or uv to ensure dependency locking and environment consistency.

Deliver

• Code Quality Report: Identify parts that do not comply with 3.10+ modern syntax or PEP 8.
• Best Practice Recommendations: Provide specific refactoring suggestions, such as converting complex logic into match/case structures.
• Validated Code: Provide Python source code accompanied by test cases and passed type checks.

Validate

• Code must run in a Python 3.10+ environment.
• Functions should have Docstrings (following Google or NumPy styles).
• Complex logic should include unit tests.
• All public APIs should have complete type hints.

Documentation

Official References

• Python 3 Official Documentation

Internal References

• Modern Python syntax evolution (3.10-3.14) and PEP 8 naming conventions
• Recommended modern Python 3.10 - 3.14 development patterns and best practices
• Outdated Python practices to avoid, common pitfalls, and security traps
• Intelligent detection and management of Python project virtual environments and dependency tools