Update app.py

app.py

@@ -39,7 +39,8 @@ def print_directory_structure(start_path, indent=''):
 def load_test_data(task):
     """Load the JSON file corresponding to the selected task"""
     # 调用函数，打印当前目录结构
-    print_directory_structure(base_dir)
+    if os.path.exists(DATA_DIR):
+        print(DATA_DIR + " is exists")
     with open(os.path.join(DATA_DIR, f"{task}.json"), "r", encoding='utf-8') as f:
         test_data = json.load(f)