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

Converting data types and making a small calculator


The most commonly used widget for accepting one-line data is the Line Edit widget, and the default data type in a Line Edit widget is string. In order to do any computation on two integer values, you need to convert the string data entered in the Line Edit widget to the integer data type and then convert the result of computation, which will be a numeric data type, back to string type before being displaying through a Label widget. This recipe does exactly that.

How to do it...

To understand how data is accepted by the user and how type casting is done, let's create an application based on the Dialog without Buttons template by performing the following steps:

  1. Add three QLabel, two QLineEdit, and one QPushButton widget to the form by dragging and dropping three Label, two Line Edit, and four Push Button widgets on the form.
  2. Set the text property of the two Label widgets to Enter First Number and Enter Second Number.
  3. Set the objectName property...