Book Image

Python GUI Programming with Tkinter.

By : Alan D. Moore
Book Image

Python GUI Programming with Tkinter.

By: Alan D. Moore

Overview of this book

Tkinter is a lightweight, portable, and easy-to-use graphical toolkit available in the Python Standard Library, widely used to build Python GUIs due to its simplicity and availability. This book teaches you to design and build graphical user interfaces that are functional, appealing, and user-friendly using the powerful combination of Python and Tkinter. After being introduced to Tkinter, you will be guided step-by-step through the application development process. Over the course of the book, your application will evolve from a simple data-entry form to a complex data management and visualization tool while maintaining a clean and robust design. In addition to building the GUI, you'll learn how to connect to external databases and network resources, test your code to avoid errors, and maximize performance using asynchronous programming. You'll make the most of Tkinter's cross-platform availability by learning how to maintain compatibility, mimic platform-native look and feel, and build executables for deployment across popular computing platforms. By the end of this book, you will have the skills and confidence to design and build powerful high-end GUI applications to solve real-world problems.
Table of Contents (23 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Chapter 4. Reducing User Error with Validation and Automation

Our form works, and both the director and data entry personnel are thrilled with the form design, but we're not ready for production yet! Our form doesn't yet perform the promised task of preventing or discouraging user errors. Number boxes still allow letters, combo boxes aren't limited to the choices given, and dates have to be filled in by hand. In this chapter, we're going to cover the following topics:

  • Deciding on the best approach for validating user input
  • Learning how to use Tkinter's validation system
  • Creating custom widgets for our form that validate entered data
  • Automating default values where appropriate in our form

Let's get started!