Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Overview of this book

Raspberry Pi cookbook for Python Programmers is a practical guide for getting the most out of this little computer. This book begins by guiding you through setting up the Raspberry Pi, performing tasks using Python 3 and introduces the first steps to interface with electronics. As you work through each chapter you will build up your skills and knowledge and apply them as you progress throughout the book, delving further and further into the unique abilities and features of the Raspberry Pi. Later, you will learn how to automate tasks by accessing files, build applications using the popular Tkinter library and create games by controlling graphics on screen. You will harness the power of the built-in graphics processor by using Pi3D to generate your own high quality 3D graphics and environments. Connect directly to the Raspberry Pi’s hardware pins to control electronics from switching on LEDs and responding to push buttons right through to driving motors and servos. Learn how to monitor sensors to gather real life data and to use it to control other devices, and view the results over the Internet. Apply what you have learnt by creating your own Pi-Rover or Pi-Hexipod robots. Finally, we will explore using many of the purpose built add-ons available for the Raspberry Pi, as well as interfacing with common household devices in new ways.
Table of Contents (18 chapters)
Raspberry Pi for Python Programmers Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Hardware and Software List
Index

Using IDLE3 to debug your programs


A key aspect of programming is being able to test and debug your code, and a useful tool to achieve this is a debugger. The IDLE editor (make sure you use IDLE3 to support the Python 3 code we use in this book) includes a basic debugger. It allows you to step through your code, observe the values of local and global variables, and set breakpoints.

How to do it…

To enable the debugger, start IDLE3 and select Debugger from the Debug menu; it will open up the following window (if you are currently running some code, you will need to stop it first):

The IDLE3 debugger window

Open up the code you want to test (via File | Open…) and try running it (F5). You will find that the code will not start, since the debugger has automatically stopped at the first line. The following screenshot shows the debugger has stopped on the first line of code in filehandler.py, which is line 3: import os:

The IDLE3 debugger at the start of the code

How it works…

The control buttons shown...