Implement robust error handling with user-friendly messages for LLM coding failures

ENHANCED ERROR HANDLING:
🔍 Error Classification:
- Syntax errors (unmatched brackets, invalid syntax)
- Variable naming errors (not defined variables)
- Data access errors (attribute access issues)
- Mathematical errors (division by zero)
- Data availability errors (empty datasets, no matching data)

👤 User-Friendly Messages:
- Replace technical error messages with understandable explanations
- Provide specific guidance based on error type
- Add actionable suggestions for users
- Hide complex technical details while still logging them

💡 Smart Suggestions:
- 'Try rephrasing your question'
- 'Use simpler terms'
- 'Check if data exists for your criteria'
- Specific advice based on error type

📊 Better UX:
- Users get helpful guidance instead of raw Python errors
- Technical details still available in generated code view
- Error logging preserved for debugging
- Encourages users to retry with better queries

This addresses the reality that LLM coding errors are inevitable - better to handle them gracefully than try to eliminate them completely.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

src.py

@@ -345,7 +345,7 @@ Complete the following code to answer the user's question:
             response = llm.invoke(query)
             answer = response.content
         
-        # Extract and execute code
+        # Extract and execute code with enhanced error handling
         try:
             if "```python" in answer:
                 code_part = answer.split("```python")[1].split("```")[0]
@@ -357,7 +357,7 @@ Complete the following code to answer the user's question:
 {code_part}
 """
             
-            # Execute code in a controlled environment
+            # Execute code in a controlled environment with better error handling
             local_vars = {}
             global_vars = {
                 'pd': pd,
@@ -374,7 +374,7 @@ Complete the following code to answer the user's question:
             if 'answer' in local_vars:
                 answer_result = local_vars['answer']
             else:
-                answer_result = "No answer variable found in generated code"
+                answer_result = "Code executed but no result was saved in 'answer' variable"
             
             execution_time = (datetime.now() - start_time).total_seconds()
             
@@ -405,11 +405,29 @@ Complete the following code to answer the user's question:
             execution_time = (datetime.now() - start_time).total_seconds()
             error_msg = str(code_error)
             
+            # Classify and provide user-friendly error messages
+            user_friendly_msg = "I encountered an error while analyzing your data. "
+            
+            if "unmatched" in error_msg.lower() or "invalid syntax" in error_msg.lower():
+                user_friendly_msg += "There was a syntax error in the generated code (missing brackets or quotes). Please try rephrasing your question or try again."
+            elif "not defined" in error_msg.lower():
+                user_friendly_msg += "There was a variable naming error in the generated code. Please try asking the question again."
+            elif "has no attribute" in error_msg.lower():
+                user_friendly_msg += "There was an issue accessing data properties. Please try a simpler version of your question."
+            elif "division by zero" in error_msg.lower():
+                user_friendly_msg += "The calculation involved division by zero, possibly due to missing data. Please try a different time period or location."
+            elif "empty" in error_msg.lower() or "no data" in error_msg.lower():
+                user_friendly_msg += "No relevant data was found for your query. Please try adjusting the time period, location, or criteria."
+            else:
+                user_friendly_msg += f"Technical error: {error_msg}"
+            
+            user_friendly_msg += "\n\n💡 **Suggestions:**\n- Try rephrasing your question\n- Use simpler terms\n- Check if the data exists for your specified criteria"
+            
             # Log the failed code execution
             log_interaction(
                 user_query=question,
                 model_name=model_name,
-                response_content=f"Error executing generated code: {error_msg}",
+                response_content=user_friendly_msg,
                 generated_code=full_code if 'full_code' in locals() else "",
                 execution_time=execution_time,
                 error_message=error_msg,
@@ -418,7 +436,7 @@ Complete the following code to answer the user's question:
             
             return {
                 "role": "assistant", 
-                "content": f"Error executing generated code: {error_msg}", 
+                "content": user_friendly_msg, 
                 "gen_code": full_code if 'full_code' in locals() else "", 
                 "ex_code": full_code if 'full_code' in locals() else "", 
                 "last_prompt": question,