Python Code Review Patterns

Overview

Python's design — dynamic typing, duck typing, mutable defaults, and the GIL — creates a class of bugs invisible to reviewers unfamiliar with the language. A reviewer applying general rules without Python context will generate false positives (flagging correct duck typing as a type error) and false negatives (missing the mutable default argument trap, which looks syntactically valid but is always wrong).

Load this skill when reviewing a Python PR, assigning severity to a Python-specific finding, or checking whether a flagged pattern is a real bug or a duck-typing false positive.

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