Book Image

Qt5 Python GUI Programming Cookbook

By : B. M. Harwani
Book Image

Qt5 Python GUI Programming Cookbook

By: B. M. Harwani

Overview of this book

PyQt is one of the best cross-platform interface toolkits currently available; it's stable, mature, and completely native. If you want control over all aspects of UI elements, PyQt is what you need. This book will guide you through every concept necessary to create fully functional GUI applications using PyQt, with only a few lines of code. As you expand your GUI using more widgets, you will cover networks, databases, and graphical libraries that greatly enhance its functionality. Next, the book guides you in using Qt Designer to design user interfaces and implementing and testing dialogs, events, the clipboard, and drag and drop functionality to customize your GUI. You will learn a variety of topics, such as look and feel customization, GUI animation, graphics rendering, implementing Google Maps, and more. Lastly, the book takes you through how Qt5 can help you to create cross-platform apps that are compatible with Android and iOS. You will be able to develop functional and appealing software using PyQt through interesting and fun recipes that will expand your knowledge of GUIs
Table of Contents (20 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Updating progress bars simultaneously using asynchronous operations


This recipe will help you understand how asynchronous operations are performed in Python. asyncio is a library in Python that supports asynchronous programming. Asynchronous means, that besides the main thread, one or more tasks will also execute in parallel. While using asyncio, you should remember that only code written in methods flagged as async can call any code in an asynchronous way. Besides this, async code can only run inside an event loop. The event loop is the code that implements multitasking. It also means that to perform asynchronous programming in Python, we need to either create an event loop or get the current thread's default event loop object.

We will be making use of two progress bars and both will be updated simultaneously via asynchronous operations.

How to do it...

Perform the following steps to understand how asynchronous operations are performed:

  1. Let's create an application based on the Dialog without...