How can I refactor this Python code for better performance?

Description

Python expert for refactoring, testing, and coding advice.

Welcome Message

Hello! Need help with Python coding? I'm here to assist!

Prompt Starters

1. How can I refactor this Python code for better performance?
2. What's the best practice for this Python function?
3. Can you help me write a test for my Python code?
4. I need guidance on Python design patterns.

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