How can I use an alert dialog with Python in linux?

This answer based on PM 2Ring answer:

I have some issue with closing the message box so I did it this way:

import Tkinter as tk
import tkMessageBox
root = tk.Tk()
root.withdraw()
tkMessageBox.showwarning('Title','Are you sure?')
root.update()

For Python3:

from tkinter import *
import tkinter as tk
from tkinter import messagebox
root = tk.Tk()
root.withdraw()
messagebox.showwarning('alert title', 'Bad things happened!')

You need to install tkinter:

sudo apt-get install python3-tk 

Another solution is using pyautogui

import pyautogui as pag
pag.alert(text="Bad things happened!", title="alert title")

You can do this with Tkinter, which is cross-platform, and commonly bundled with the standard Python package.

import Tkinter as tk
import tkMessageBox
root = tk.Tk()
root.withdraw()
tkMessageBox.showwarning('alert title', 'Bad things happened!')

(On Python 3, you need to change the first line to import tkinter as tk. And the import tkMessageBox line becomes from tkinter import messagebox, and a matching change is required for the last line).

The next two lines create a root window for the application (which all Tkinter programs need), but then make that window invisible. And finally we display our alert.

You may need to install python-tk (i.e. sudo apt-get install python-tk in Ubuntu distributions) before using Tkinter - it's not installed by default on some distributions.

To create a notification rather than a dialog box that needs to be dismissed, you can use notify-send as shown below. This also does not require installing python-tk or other packages.

import subprocess
subprocess.run(["/usr/bin/notify-send", "--icon=error", "This is your error message ..."])

See the man page for more options.