Python Code Quality

High-value Python code-quality anti-patterns to check during review or self-review. This skill is review-focused: it covers correctness and readability defects that a reviewer (or a linter) should flag, separate from testing mechanics (pytest) and whole-codebase health scoring (code-quality-scoring).

Source note: These anti-patterns are derived from CAST Highlight's Python code quality indicators (https://doc.casthighlight.com/), which reference PEP 8 and the Python data model as primary sources. Where a rule mirrors PEP 8, the PEP is the authoritative source. All examples are original.

When to Use This Skill

Use it when the task is "is this Python code clean and correct?" — for example: