How can I create a simple message box in Python?

Question

I\'m looking for the same effect as alert() in JavaScript.

I wrote a simple web-based interpreter this afternoon using Twisted.web. You basically submit

Answer 1

I had to add a message box to my existing program. Most of the answers are overly complicated in this instance. For Linux on Ubuntu 16.04 (Python 2.7.12) with future proofing for Ubuntu 20.04 here is my code:

Program top

from __future__ import print_function       # Must be first import

try:
    import tkinter as tk
    import tkinter.ttk as ttk
    import tkinter.font as font
    import tkinter.filedialog as filedialog
    import tkinter.messagebox as messagebox
    PYTHON_VER="3"
except ImportError: # Python 2
    import Tkinter as tk
    import ttk
    import tkFont as font
    import tkFileDialog as filedialog
    import tkMessageBox as messagebox
    PYTHON_VER="2"

Regardless of which Python version is being run, the code will always be messagebox. for future proofing or backwards compatibility. I only needed to insert two lines into my existing code above.

Message box using parent window geometry

''' At least one song must be selected '''
if self.play_song_count == 0:
    messagebox.showinfo(title="No Songs Selected", \
        message="You must select at least one song!", \
        parent=self.toplevel)
    return

I already had the code to return if song count was zero. So I only had to insert three lines in between existing code.

You can spare yourself complicated geometry code by using parent window reference instead:

parent=self.toplevel

Another advantage is if the parent window was moved after program startup your message box will still appear in the predictable place.