python-gotchas

Your Python function likely suffers from mutable default arguments, a common gotcha where default values are evaluated only once at function definition. This Skill identifies the issue and provides corrected code examples using None to ensure robust, predictable behavior.

Python scope rules follow the LEGB order—Local, Enclosing, Global, and Built-in—to resolve variable names. This Skill explains how this mechanism works and provides solutions to prevent scope-related bugs in your programming.

The best way to fix late binding in Python closures is to bind the current variable value using a default argument in the inner function. This Skill explains this subtle language behavior and provides corrected code examples for robust programming.

Dictionary mutation during iteration causes a runtime error because Python prevents modifying a dictionary's structure while traversing it. This Skill identifies this iteration pitfall and provides solutions like iterating over a copied list of items to ensure safe debugging.

You identify common Python gotchas by learning subtle language behaviors like mutable default arguments, LEGB scope rules, and late binding in closures. This Skill highlights these programming pitfalls and provides solutions to ensure predictable, high-quality code.