Update app.py

app.py

@@ -110,8 +110,8 @@ def get_data(query: str):
 
     for doc in found_docs:
         doc.pop("id", None)
-        key = doc["metadata"].keys()
-        for k in key:
+        # key = 
+        for k in list(doc["metadata"].keys()):
             if k[0] == "_":
                 doc["metadata"].pop(k)