Getting Started with Python and Raspberry Pi

Dan Nixon

• Publisher: Packt Publishing
• Year: 2015
• ISBN:
  9781785285837
• Edition: 1
• Topic: Ciencia de la computación
• Subtopic: Lenguajes de programación

Learn to design and implement reliable Python applications on the Raspberry Pi using a range of external libraries, the Raspberry Pis GPIO port, and the camera moduleAbout This Book• Learn the fundamentals of Python scripting and application programming• Design user-friendly command-line and graphical user interfaces• A step-by-step guide to learning Python programming with the PiWho This Book Is ForThis book is designed for those who are unfamiliar with the art of Python development and want to get to know their way round the language and the many additional libraries that allow you to get a full application up and running in no time.What You Will Learn• Fundamentals of Python applications• Designing applications for multi-threading• Interacting with electronics and physical devices• Debugging applications when they go wrong• Packaging and installing Python modules• User interface design using Qt• Building easy to use command-line interfaces• Connecting applications to the InternetIn DetailThe 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.Style and approachAn easy-to-follow introduction to Python scripting and application development through clear conceptual explanations backed up by real-world examples on the Raspberry Pi.

Getting Started with Python and Raspberry Pi

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Table of Contents

Getting Started with Python and Raspberry Pi

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Your First Steps with Python on the Pi

Installing and setting up Raspbian

Writing to the SD card

Windows

Linux and Mac

Booting the Pi for the first time

The Python development tools

Python 2 versus Python 3

Running some simple Python scripts

Summary

2. Understanding Control Flow and Data Types

Data in Python

Numerical types

Operations on numerical types

String manipulation

String functions

String formatting

String templates

Control flow operators

Using functions

Summary

3. Working with Data Structures and I/O

Data structures

Lists

Creating lists

List operations

Dictionaries

Creating dictionaries

Dictionary operations

Sets

Set operations

Frozen sets

Tuples

Input/output

The os.path module

Reading and writing files

Summary

4. Understanding Object-oriented Programming and Threading

Object-oriented programming

Classes in Python

Operation.py

Calculator.py

Using the module

Inheritance

Threading

Locks

Summary

5. Packaging Code with setuptools

Using packages in your Python code

Importing modules

Installing modules manually

Installing modules using pip

Installing modules using apt

Packaging your own Python modules

Packaging a library

Adding an entry point

Summary

6. Accessing the GPIO Pins

Digital electronics

The GPIO library

Single LED output

PWM output

Multiple outputs

Basic switch

Switch using interrupt

Universal Asynchronous Receiver/Transmitter (UART)

Setting up the serial port

Using pySerial

Additional libraries

Summary

7. Using the Camera Module

Setting up the camera module

Installing and testing the Python library

Writing applications for the camera

A time lapse recorder

A point-and-shoot camera

An image effect randomizer

Summary

8. Extracting Data from the Internet

Using urllib2 to download data

Parsing JSON APIs

Parsing XML APIs

The DOM method

The SAX method

Parsing a web page using BeautifulSoup

Summary

9. Creating Command-line Interfaces

Unit conversion application

Command-line interface

Summary

10. Debugging Applications with PDB and Log Files

The Python debugger

Writing log files

Unit testing

Summary

11. Designing Your GUI with Qt

Setting up the codebase

Building the UI with Qt Designer

Writing the UI code

Launching the UI

Packaging the code

Summary

Index

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

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78355-159-0

www.packtpub.com

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 hel...