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- Herausgeber: Packt Publishing
- Kategorie: Fachliteratur
- Sprache: Englisch
The Raspberry Pi is one of the smallest and most affordable single board computers that has taken over the world of hobby electronics and programming, and the Python programming language makes this the perfect platform to start coding with.
The book will start with a brief introduction to Raspberry Pi and Python. We will direct you to the official documentation that helps you set up your Raspberry Pi with the necessary equipment such as the monitor, keyboard, mouse, power supply, and so on. It will then dive right into the basics of Python programming. Later, it will focus on other Python tasks, for instance, interfacing with hardware, GUI programming, and more. Once you get well versed with the basic programming, the book will then teach you to develop Python/Raspberry Pi applications.
By the end of this book, you will be able to develop Raspberry Pi applications with Python and will have good understanding of Python programming for Raspberry Pi.
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Seitenzahl: 167
Veröffentlichungsjahr: 2015
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Table of Contents
Getting Started with Python and Raspberry Pi
Getting Started with Python and Raspberry Pi
Copyright © 2015 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: September 2015
Production reference: 1210915
Published by Packt Publishing Ltd.
Livery Place
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Birmingham B3 2PB, UK.
ISBN 978-1-78355-159-0
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Credits
Author
Dan Nixon
Reviewers
Ankit Aggarwal
Neil Broers
Yash Gajera
Bhavyanshu Parasher
David Whale
Commissioning Editor
Dipika Gaonkar
Acquisition Editor
Indrajit Das
Content Development Editor
Zeeyan Pinheiro
Technical Editor
Namrata Patil
Copy Editor
Alpha Singh
Project Coordinator
Suzanne Coutinho
Proofreader
Safis Editing
Indexer
Tejal Soni
Graphics
Jason Monteiro
Production Coordinator
Manu Joseph
Cover Work
Manu Joseph
About the Author
Dan Nixon is a software and electronics engineer living in the north of England. He has past experience of creating software for data analysis, process control, and business intelligence applications. In most of these projects, Python was one of the main languages used.
Dan previously authored another book on the uses of the Raspberry Pi, called Raspberry Pi Blueprints, and has worked on many personal projects that use both Python and the Raspberry Pi.
I would like to thank my mother and father for their support in writing this book and Greg Fenton for his help in testing some of the examples included.
About the Reviewers
Ankit Aggarwal has been fascinated with science and technology since childhood. He likes to experiment and learn new things. He is a software engineer and researcher by profession and loves computer science. He wants to solve problems using technology. His interests include science, technology, academic research, music, photography, entrepreneurship, DIY, movies, anime, and much more.
He has worked in the fields of networking, distributed systems, pervasive/mobile computing, data science, AI, and computer vision; the list goes on. Ankit has authored IEEE Xplore research papers and is an active contributor to and author of several open source projects. He is socially active, blogs occasionally, and maintains his website at http://ankitaggarwal.me.
In his free time, he reads, takes part in competitive programming, captures photos of nature with a lens, and watches TV shows, movies, and anime. When he is not doing these things, he can be found jogging at the nearest ground.
Neil Broers is a Python developer by day and a hardware hacker by night, building his "Smart Home," one Raspberry Pi at a time. He is an avid technical blogger on www.foo.co.za, where he documents his adventures with home automation. In 2014, he presented a talk on the Raspberry Pi and the Internet of Things at the PyConZA conference in South Africa.
Yash Gajera is an embedded software engineer at Insignex in Anand, India. He studied electronics and communication engineering and graduated in 2014 from the A. D. Patel Institute of Technology, Anand. At Insignex, he has worked on fully automated irrigation control systems. He did his final year project on the Internet of Things. It was selected as the best project from the EC department at Gujarat Technological University in 2014. Yash wrote a Python library for the Zigbee protocol to work with the Raspberry Pi. He also has a lot of experience in embedded system development and web technologies.
Bhavyanshu Parasher holds a BTech degree in computer science engineering. He is currently working toward getting a master's degree in computer science. He has been developing web applications since 2011. He also has experience in developing apps for Android and Linux. He has authored and contributed to various open source projects. Apart from computer science, he is also interested in electronics. He has developed various projects using the Raspberry Pi, including service bots, weather monitoring systems, and data analysis automation tools. When he is not writing code, he spends time writing tutorials on his blog at https://bhavyanshu.me.
David Whale is a software developer living in Essex, UK. He started coding as a schoolboy aged 11, inspired by the school science technician to build his own computer from a kit, and quickly progressed to writing machine code programs because they were "small and fast." These early experiments led to some of his code being used in a saleable educational word game when he was only 13.
David has been developing software professionally ever since, mainly writing small and fast code that goes into electronic products, including automated machinery, electric cars, mobile phones, energy meters, and wireless doorbells.
These days, he runs his own software consultancy called Thinking Binaries. He spends much of his time helping design the next wave of the Internet, called the Internet of Things. This means connecting electronic devices to the Internet. The rest of the time, he volunteers for The Institution of Engineering and Technology, running training courses for teachers, designing and running workshops and clubs for school children, and generally being busy with his Raspberry Pi.
David was the technical editor of the book Adventures in Raspberry Pi. He is a coauthor of the book Adventures in Minecraft and is the technical editor of the official Raspberry Pi magazine, the MagPi.
I was really pleased to be asked to review this new book. Dan Nixon has done an excellent job of getting you started with Python and your Raspberry Pi, and he presents the material in an easy-to-follow format. There are lots of fun ideas and building blocks here, which I hope many readers will extend into bigger and more ambitious projects of their own.
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Preface
The Raspberry Pi is one of the smallest and most affordable single board computers that has taken over the world of hobby electronics and programming, and the Python programming language makes this the perfect platform to start coding with.
Getting Started with Python and Raspberry Pi will guide you through the process of designing, implementing, and debugging your own Python applications to run on the Raspberry Pi and will help you interact with some of its unique hardware.
What this book covers
Chapter 1, Your First Steps with Python on the Pi, introduces the Python development tools as you install and set them up on the Raspberry Pi after installing the Raspbian operating system.
Chapter 2, Understanding Control Flow and Data Types, introduces you to the control flow and conditional execution operations. Also, the basic data types and the operations that can be performed on them will be covered in this chapter.
Chapter 3, Working with Data Structures and I/O, gives you an overview of the standard Python data structures (for example, list, dict, and tuple) and how they can be used within an application. Also, this chapter will provide an introduction to reading and writing files on the Raspberry Pi's filesystem, including reading from the sysfs to get data such as the current temperature of the processor.
Chapter 4, Understanding Object-oriented Programming and Threading, introduces the concept of object-oriented programming and compares it to the functional programming that has been done up to this point in this book.
Chapter 5, Packaging Code with setuptools, introduces you to the setup tools in the Python package, which are used to package Python applications and libraries for easier installation. This will also include an introduction to the pip utility and PyPi package repository.
Chapter 6, Accessing the GPIO Pins, gives you an overview of the Python library for accessing the GPIO pins on the Raspberry Pi and a brief introduction to some basic electronics needed for the tutorials in the chapter.
Chapter 7, Using the Camera Module, covers using the picamera Python library to interact with the camera module, the options that can be configured using the library, and writing a simple application to record a section of video in several different modes.
Chapter 8, Extracting Data from the Internet, covers the use of several libraries (including requests and urllib2) to connect to webservers and request data, and will include obtaining weather forecasts from an online API. Also, you will be introduced to several third-party libraries that access data from specific sources.
Chapter 9, Creating Command-line Interfaces, covers interaction with applications via the command line using the argparse Python module.
Chapter 10, Debugging Applications with PDB and Log Files, introduces you to the PDB (Python debugger) tool, discusses how it can be used to diagnose and fix issues in Python programs, and covers how the logging Python module can be used to capture information from an application to be used later for debugging. This includes a tutorial in which code with several issues placed into it will be debugged and corrected.
Chapter 11, Designing Your GUI with Qt, provides an introduction to GUI design with Qt using Qt Designer and the Python Qt package.
What you need for this book
You will need:
Who this book is for
This book is designed for those who are unfamiliar with the art of Python development and want to get to know their way around the language and the many additional libraries that allow you to get a full application up and running in no time.
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Chapter 1. Your First Steps with Python on the Pi
In this chapter, we will look at setting up the Raspbian operating system on the Raspberry Pi and have a quick look at the Python development tools that come pre-installed on it, along with looking at some basic ways in which we can execute the Python code.
The only things that are required here are:
Installing and setting up Raspbian
The first thing we need to do is head to the Raspberry Pi downloads page at https://www.raspberrypi.org/downloads/ and download the latest version of Raspbian. This is a version of the Debian Linux distribution, specifically designed for the Raspberry Pi.
Writing to the SD card
The next step is to write the just downloaded operating system image to the SD card so that it can be used with the Pi. The way this is done varies depending on the operating system you use on your main PC.
Windows
On Windows, we will use a tool called Win32 Disk Imager to write the OS image to the SD card. This tool can be downloaded from the SourceForge page at sourceforge.net/projects/win32diskimager.
The important thing to check is that a drive letter appears in the Device drop down list. If this does not happen then Win32 Disk Imager has failed to recognize your SD card. In such a case, try it in a different SD card reader. If it still does not work then it could indicate that the card has failed.
Next, browse to select the .img file you had previously extracted from the downloaded Zip archive and click the Write button as shown in the following screenshot, after first making sure that the correct device is selected in the Device drop down list:
