Update app.py

app.py

@@ -149,7 +149,7 @@ def submit_answers_pretest(question1, question2, question3, question4, question5
     answers['Question 10'] = question10
     
     # 可以将结果保存到文件
-    with open('answers4pretest.txt', 'a') as f:
+    with open('./answers4pretest.txt', 'a') as f:
         f.write(f"Question 1: {question1}\n")
         f.write(f"Question 2: {question2}\n")
         f.write(f"Question 3: {question3}\n")
@@ -177,7 +177,7 @@ def submit_answers_posttest(question1, question2, question3, question4, question
     answers['Question 10'] = question10
     
     # 可以将结果保存到文件
-    with open('answers4posttest.txt', 'a') as f:
+    with open('./answers4posttest.txt', 'a') as f:
         f.write(f"Question 1: {question1}\n")
         f.write(f"Question 2: {question2}\n")
         f.write(f"Question 3: {question3}\n")