Update app2.py

app2.py

@@ -4,7 +4,7 @@ from datetime import date
 from datetime import datetime
 from dateutil.relativedelta import relativedelta, MO
 import param
-import ast
+import json
 
 from functools import partial
 from src.search import Search_Papers
@@ -29,7 +29,7 @@ def load_categories():
     with open('categories_arxiv.txt') as f:
         data = f.read()
     # reconstructing the data as a dictionary
-    category_dict = ast.literal_eval(data)
+    category_dict = json.loads(data)
     list_categories = list(demoDictionary.values())
     return list_categories