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Python GUI Programming Cookbook, Second Edition

Python GUI Programming Cookbook, Second Edition - Second Edition

By : Burkhard Meier
2.5 (2)
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Python GUI Programming Cookbook, Second Edition

Python GUI Programming Cookbook, Second Edition

2.5 (2)
By: Burkhard Meier
Buy this Book

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 (13 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Sections
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1
Creating the GUI Form and Adding Widgets
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Creating the GUI Form and Adding Widgets
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Creating our first Python GUI
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Preventing the GUI from being resized
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Adding a label to the GUI form
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Creating buttons and changing their text attributes
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Creating textbox widgets
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Setting the focus to a widget and disabling widgets
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Creating combobox widgets
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Creating a check button with different initial states
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Using radio button widgets
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Using scrolled text widgets
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Adding several widgets in a loop
2
Layout Management
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Layout Management
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Arraning several labels within a label frame widget
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Using padding to add space around widgets
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Dynamically expanding the GUI using widgets
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Aligning GUI widgets by embedding frames within frames
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Creating menu bars
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Creating tabbed widgets
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Using the grid layout manager
3
Look and Feel Customization
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Look and Feel Customization
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Creating message boxes – information, warning, and error
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How to create independent message boxes
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How to create the title of a tkinter window form
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Changing the icon of the main root window
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Using a spin box control
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Applying relief – the sunken and raised appearance of widgets
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Creating tooltips using Python
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Adding Progressbar to the GUI
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How to use the canvas widget
4
Data and Classes
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Data and Classes
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How to use StringVar()
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How to get data from a widget
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Using module-level global variables
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How coding in classes can improve the GUI
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Writing callback functions
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Creating reusable GUI components
5
Matplotlib Charts
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Matplotlib Charts
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Installing Matplotlib using pip with the .whl extension
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Creating our first chart
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Placing labels on charts
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How to give the chart a legend
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Scaling charts
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Adjusting the scale of charts dynamically
6
Threads and Networking
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Threads and Networking
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How to create multiple threads
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Starting a thread
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Stopping a thread
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How to use queues
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Passing queues among different modules
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Using dialog widgets to copy files to your network
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Using TCP/IP to communicate via networks
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Using urlopen to read data from websites
7
Storing Data in Our MySQL Database via Our GUI
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Storing Data in Our MySQL Database via Our GUI
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Installing and connecting to a MySQL server from Python
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Configuring the MySQL database connection
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Designing the Python GUI database
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Using the SQL INSERT command
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Using the SQL UPDATE command
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Using the SQL DELETE command
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Storing and retrieving data from our MySQL database
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Using MySQL Workbench
8
Internationalization and Testing
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Internationalization and Testing
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Displaying widget text in different languages
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Changing the entire GUI language all at once
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Localizing the GUI
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Preparing the GUI for internationalization
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How to design a GUI in an agile fashion
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Do we need to test the GUI code?
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Setting debug watches
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Configuring different debug output levels
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Creating self-testing code using Python's __main__ section
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Creating robust GUIs using unit tests
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How to write unit tests using the Eclipse PyDev IDE
9
Extending Our GUI with the wxPython Library
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Extending Our GUI with the wxPython Library
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Installing the wxPython library
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Creating our GUI in wxPython
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Quickly adding controls using wxPython
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Trying to embed a main wxPython app in a main tkinter app
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Trying to embed our tkinter GUI code into wxPython
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Using Python to control two different GUI frameworks
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Communicating between the two connected GUIs
10
Building GUIs with PyQt5
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Building GUIs with PyQt5
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Installing PyQt5
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Installing the PyQt5 Designer tool
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Writing our first PyQt5 GUI
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Changing the title of the GUI
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Refactoring our code into object-oriented programming
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Inheriting from QMainWindow
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Adding a status bar widget
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Adding a menu bar widget
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Starting the PyQt5 Designer tool
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Previewing the form within the PyQt5 Designer
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Saving the PyQt5 Designer form
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Converting Designer .ui code into .py code
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Understanding the converted Designer code
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Building a modular GUI design
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Adding another menu item to our menu bar
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Connecting functionality to the Exit menu item
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Adding a Tab Widget via the Designer
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Using layouts in the Designer
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Adding buttons and labels in the Designer
11
Best Practices
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Best Practices
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Avoiding spaghetti code
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Using __init__ to connect modules
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Mixing fall-down and OOP coding
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Using a code naming convention
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When not to use OOP
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How to use design patterns successfully
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Avoiding complexity
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GUI design using multiple notebooks
12
Other Books You May Enjoy
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Other Books You May Enjoy
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Creating message boxes – information, warning, and error

A message box is a pop-up window that gives feedback to the user. It can be informational, hinting at potential problems as well as catastrophic errors.

Using Python to create message boxes is very easy.

Getting ready

We will add functionality to the Help | About menu item we created in the previous chapter, in the Creating tabbed widgets recipe. 

The code is from GUI_tabbed_all_widgets_both_tabs.py. The typical feedback to the user when clicking the Help | About menu in most applications is informational. We start with this information and then vary the design pattern to show warnings and errors.

How to do it…

Add the following line of code to the top of the module where the import statements live:

Next, create a callback function that will display a message box. We have to locate the code of the callback above the code where we attach the callback to the menu item, because this is still procedural and not OOP code.

Add the following code...

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Tech Concepts
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Programming languages
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Python GUI Programming Cookbook, Second Edition
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