Alerts

The most simple type of GUI is the alert. Just print something to inform the user of a result or event in a graphical box:

How to do it...

Alerts in tkinter are managed by the messagebox object and we can create one simply by asking messagebox to show one for us:

from tkinter import messagebox


def alert(title, message, kind='info', hidemain=True):
    if kind not in ('error', 'warning', 'info'):
        raise ValueError('Unsupported alert kind.')

    show_method = getattr(messagebox, 'show{}'.format(kind))
    show_method(title, message)

Once we have our alert helper in place, we can initialize a Tk interpreter and show as many alerts as we want:

from tkinter import Tk

Tk().withdraw()
alert('Hello', 'Hello World')
alert('Hello Again', 'Hello World 2', kind='warning')

If everything worked as expected, we should see a pop-up dialog and, once dismissed, a new one should come up with Hello Again.

How it works...

The alert function itself is just a thin wrapper over what tkinter.messagebox...