Update app.py

app.py

@@ -110,7 +110,7 @@ def submit_permission(staff_id, date, f, t, reason):
 
     perms = load_permissions()
 
-    # Max 2 per day
+    # Max 2 per day rule
     today = perms[
         (perms["StaffID"] == staff_id) &
         (perms["Date"] == date)
@@ -135,12 +135,15 @@ def submit_permission(staff_id, date, f, t, reason):
         "SubmittedOn": now
     }
 
-    perms = perms._append(new_row, ignore_index=True)
+    # ✅ Correct way to append in Pandas 2.x
+    perms = pd.concat(
+        [perms, pd.DataFrame([new_row])],
+        ignore_index=True
+    )
+
     perms.to_excel(PERMISSION_FILE, index=False)
 
     return "✅ Permission Submitted Successfully"
-
-
 def delete_permission(staff_id, date):
 
     perms = load_permissions()