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How to Cancel Window Close Event in Tk (tkinter)

import tkinter as tk
from tkinter import messagebox

def delete_window():
# Function called when the user tries to close the window.
close = messagebox.askyesno(
message="Are you sure you want to close the application?",
title="Confirm Exit"
if close:

root = tk.Tk()
# Replace Tk's default procedure with our own function to close the window.
root.protocol("WM_DELETE_WINDOW", delete_window)

If you just want to cancel the window close event without asking for confirmation, better use:

# Always disable window closing.
root.protocol("WM_DELETE_WINDOW", lambda: None)

tkinter window desktop-application

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