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Python GUI Programming Cookbook

Python GUI Programming Cookbook

By : Burkhard Meier
4.4 (11)
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Python GUI Programming Cookbook

Python GUI Programming Cookbook

4.4 (11)
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. Its flexible syntax enables developers to write short scripts while at the same time, they can use object-oriented concepts to develop very large projects. 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 uses the simplest programming style, using the fewest lines of code to create a GUI in Python, and then advances to using object-oriented programming in later chapters. If you are new to object-oriented programming (OOP), this book will teach you how to take advantage of the OOP coding style in the context of creating GUIs written in Python. Throughout the book, you will develop an entire GUI application, building recipe upon recipe, connecting the GUI to a database. In the later chapters, you will explore additional Python GUI frameworks, using best practices. You will also learn how to use threading to ensure your GUI doesn’t go unresponsive. By the end of the book, you will be an expert in Python GUI programming to develop a common set of GUI applications.
Table of Contents (13 chapters)
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12
Index

Starting a thread


This recipe will show us how to start a thread. It will also demonstrate why threads are necessary to keep our GUI responsive during long-running tasks.

Getting ready

Let's first see what happens when we call a function or method of our GUI that has some sleep associated with it without using threads.

Note

We are using a sleep here to simulate a real-world application that might have to wait for a web server or database to respond or a large file transfer or complex computation to complete its task.

The sleep is a very realistic place-holder and shows the principle involved.

Adding a loop into our button callback method with some sleep time results in our GUI becoming unresponsive and, when we try to close the GUI, things get even worse.

# Button callback
def clickMe(self):
  self.action.configure(text='Hello ' + self.name.get())
  # Non-threaded code with sleep freezes the GUI
  for idx in range(10):
    sleep(5)
    self.scr.insert(tk.INSERT, str(idx) + '\n')

If we wait long...

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Python GUI Programming Cookbook
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