Welcome folks today in this blog post we will be showing popup messagebox dialog box using msgbox.showinfo() method on button click in tkinter gui desktop app in python. All the full source code of the application is given below.

Get Started

In order to get started you need to install the below library using the pip command as shown below

pip install tkinter

After installing this library you need to make an app.py file and copy paste the following code

app.py

import tkinter as tk
import tkinter.messagebox as msgbox

class Window(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("Hello Tkinter")
        self.label_text = tk.StringVar()
        self.label_text.set("Choose One")

        self.label = tk.Label(self, textvar=self.label_text)
        self.label.pack(fill=tk.BOTH, expand=1, padx=100, pady=30)

        hello_button = tk.Button(self, text="Say Hello", command=self.say_hello)
        hello_button.pack(side=tk.LEFT, padx=(20, 0), pady=(0, 20))

        goodbye_button = tk.Button(self, text="Say Goodbye", command=self.say_goodbye)
        goodbye_button.pack(side=tk.RIGHT, padx=(0, 20), pady=(0, 20))

    def say_hello(self):
        msgbox.showinfo("Hello", "Hello World!")

    def say_goodbye(self):
        self.label_text.set("Window will close in 2 seconds")
        msgbox.showinfo("Goodbye!", "Goodbye, it's been fun!")
        self.after(2000, self.destroy)


if __name__ == "__main__":
    window = Window()
    window.mainloop()

If you execute the above python script by typing the below command

python app.py