Book Image

Python GUI Programming Cookbook, Second Edition - Second Edition

By : Burkhard Meier
Book Image

Python GUI Programming Cookbook, Second Edition - Second Edition

By: Burkhard Meier

Overview of this book

Python is a multi-domain, interpreted programming language. It is a widely used general-purpose, high-level programming language. It is often used as a scripting language because of its forgiving syntax and compatibility with a wide variety of different eco-systems. Python GUI Programming Cookbook follows a task-based approach to help you create beautiful and very effective GUIs with the least amount of code necessary. This book will guide you through the very basics of creating a fully functional GUI in Python with only a few lines of code. Each and every recipe adds more widgets to the GUIs we are creating. While the cookbook recipes all stand on their own, there is a common theme running through all of them. As our GUIs keep expanding, using more and more widgets, we start to talk to networks, databases, and graphical libraries that greatly enhance our GUI’s functionality. This book is what you need to expand your knowledge on the subject of GUIs, and make sure you’re not missing out in the long run.
Table of Contents (18 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

How to use StringVar()


There are built-in programming types in tkinter that differ slightly from the Python types we are used to programming with. StringVar() is one such tkinter type. This recipe will show you how to use the StringVar() type.

Getting ready

You will learn how to save data from the tkinter GUI into variables so we can use that data. We can set and get their values, which is very similar to the Java getter/setter methods.

Here are some of the available types of coding in tkinter:

strVar = StringVar()

# Holds a string; the default value is an empty string ""

intVar = IntVar()

# Holds an integer; the default value is 0

dbVar = DoubleVar()

# Holds a float; the default value is 0.0

blVar = BooleanVar()

# Holds a Boolean, it returns 0 for False and 1 for True

Note

Different languages call numbers with decimal points as floats or doubles. Tkinter calls them DoubleVar, what is known in Python as float datatype. Depending on the level of precision, float and double data can be different. Here...