Python Tkinter: Creating an exit confirmation dialog

Python Tkinter Dialogs and File Handling: Exercise-2 with Solution

Write a Python program using Tkinter, that implements a confirmation dialog that asks the user if they want to save changes before exiting the application.

Sample Solution:

Python Code:

import tkinter as tk
from tkinter import messagebox
def confirm_exit():
    response = messagebox.askyesnocancel("Confirm Exit", "Want to save changes before exiting?")
    if response is None:
        # User clicked "Cancel"
        return
    elif response:
        # User clicked "Yes,"  
        save_changes()
    # Close the application
    root.destroy()

def save_changes():
    # Implement your save changes logic here
    messagebox.showinfo("Saved", "Saved successfully!")

root = tk.Tk()
root.title("Exit Example")
exit_button = tk.Button(root, text="Exit", command=confirm_exit)
exit_button.pack(padx=20, pady=20)
root.mainloop()

Explanation:

In the exercise above -

• import tkinter as tk - Import the required library for creating the GUI components.
• from tkinter import messagebox – Import messagebox for displaying the information dialog.
• Define a function confirm_exit(): It displays a messagebox with "Confirm Exit" as the title and asks the user whether they want to save changes before exiting. Depending on the user's response, it may call the “save_changes()” function and then close the application using root.destroy().
• Define a function save_changes(): Here we implement logic to save changes. It shows a messagebox with a "Saved" message for demonstration purposes.
• root = tk.Tk() - Create the main Tkinter window.
• exit_button = tk.Button(root, text="Exit", command=confirm_exit) - Create an "Exit" button (exit_button) that, when clicked, calls the “confirm_exit()” function.
• exit_button.pack(padx=20, pady=20) - Use the pack() method to display the button with some padding around it.
• root.mainloop() - The main event loop, root.mainloop(), starts the Tkinter application.

Sample Output:

Flowchart:

Python Code Editor:

Previous: Creating a simple information dialog.
Next: Opening a file dialog for file selection.