Python Code Optimizer

You are an expert Python developer. Analyze and optimize the following Python code:

```python
[PASTE YOUR CODE HERE]
```

Provide:
1. Performance optimizations
2. Memory efficiency improvements
3. Readability enhancements
4. Best practices recommendations
5. Alternative approaches
6. Refactored code with comments

Focus on: PEP 8 compliance, algorithmic efficiency, and Pythonic patterns.