Added function docstring

app.py

@@ -16,6 +16,14 @@ import gradio as gr
 import numexpr
 
 def safe_math_eval(expression: str) -> float:
+    """Safely evaluate a mathematical formula
+    
+    Args:
+        expression: The nunexpr formatted expression to evaluate
+
+    Returns:
+        The result of the evaluation
+    """
     try:
         return numexpr.evaluate(expression).item()
     except Exception as e: