Update app.py

app.py

@@ -109,12 +109,14 @@ for i in questions:
 submit_button = Quiz.form_submit_button("Submit")
 
 def calculate_average(numbers):
+    if numbers = []:
+        return f'has not been calculated yet.'
     numbers = [int(x) for x in numbers if isinstance(x, (int, str))]
 
 
     total = sum(numbers)
     average = total / len(numbers)
-    return average
+    return f'is {average}%'
 
 if submit_button:
     for i, q in enumerate(questions):  # This line was missing the enumeration
@@ -145,4 +147,4 @@ if submit_button:
         else:
             x = x + 1
     
-st.subheader(f'Your average score for the answers is {calculate_average(scores)}')
+st.subheader(f'Your average score for the answers {calculate_average(scores)}')