Book Image

Modern Python Standard Library Cookbook

By : Alessandro Molina
Book Image

Modern Python Standard Library Cookbook

By: Alessandro Molina

Overview of this book

The Python 3 Standard Library is a vast array of modules that you can use for developing various kinds of applications. It contains an exhaustive list of libraries, and this book will help you choose the best one to address specific programming problems in Python. The Modern Python Standard Library Cookbook begins with recipes on containers and data structures and guides you in performing effective text management in Python. You will find Python recipes for command-line operations, networking, filesystems and directories, and concurrent execution. You will learn about Python security essentials in Python and get to grips with various development tools for debugging, benchmarking, inspection, error reporting, and tracing. The book includes recipes to help you create graphical user interfaces for your application. You will learn to work with multimedia components and perform mathematical operations on date and time. The recipes will also show you how to deploy different searching and sorting algorithms on your data. By the end of the book, you will have acquired the skills needed to write clean code in Python and develop applications that meet your needs.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

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...