Update app.py

app.py

@@ -20,7 +20,7 @@ def log_attendance(name, day, date, status):
 
     # Add new attendance record
     new_entry = {"Name": name, "Day": day, "Date": date, "Status": status}
-    df = df.append(new_entry, ignore_index=True)
+    df = pd.concat([df, pd.DataFrame([new_entry])], ignore_index=True)
 
     # Save back to the file
     df.to_csv(file_path, index=False)