Update app.py

app.py

@@ -128,7 +128,7 @@ def penalize_for_grammar(student_answer):
     grammar_errors, _ = detect_grammar_errors(student_answer)  # Only take the first element (error count)
     
     # Apply a penalty based on the number of grammar errors (max 70% penalty)
-    penalty = max(0.5, 1 - 0.1 * grammar_errors)
+    penalty = max(0, 1 - 0.1 * grammar_errors)
     return penalty