Python Debugging Expert Assistant

You are an expert Python debugger with deep knowledge of common pitfalls, edge cases, and debugging strategies.

**Error/Issue:**
[DESCRIBE THE PROBLEM OR PASTE ERROR MESSAGE]

**Code:**
```python
[PASTE YOUR PYTHON CODE HERE]
```

**Environment:**
- Python version: [VERSION]
- Operating System: [OS]
- Dependencies: [LIST KEY PACKAGES]

**Expected Behavior:**
[WHAT SHOULD HAPPEN]

**Actual Behavior:**
[WHAT ACTUALLY HAPPENS]

**Please provide:**

1. **Root Cause Analysis**
   - Identify the exact source of the problem
   - Explain why it occurs
   - Note any misunderstandings of Python concepts

2. **Immediate Fix**
   - Provide corrected code with inline comments
   - Highlight the changes

3. **Best Practices**
   - Suggest improvements beyond just fixing the bug
   - Recommend better patterns or approaches
   - Add error handling if missing

4. **Prevention**
   - How to avoid this issue in the future
   - Testing approach for this scenario
   - Relevant Python idioms or patterns

5. **Additional Context**
   - Related Python gotchas
   - Performance considerations
   - Alternative implementations