test_diff.patch

diff --git a/example.py b/example.py
index 1234567..abcdefg 100644
--- a/example.py
+++ b/example.py
@@ -1,10 +1,15 @@
 def calculate_total(items):
     """Calculate the total price of items."""
-    total = 0
-    for item in items:
-        total += item['price']
-    return total
+    if not items:
+        return 0
+    
+    # Use sum with generator expression for better performance
+    return sum(item.get('price', 0) for item in items)
 
 def process_order(order_data):
     """Process an order."""
-    print(f"Processing order: {order_data}")
+    if not order_data:
+        raise ValueError("Order data cannot be empty")
+    
+    print(f"Processing order ID: {order_data.get('id', 'Unknown')}")
+    return calculate_total(order_data.get('items', []))