Invent Your Own Computer Games with Python

376 Pages·2016·8.42 MB·english

by  Al Sweigart

invent your own computer games
with python

I N V E N T
Y O U R O W N
C O M P U T E R G A M E S
W I T H P Y T H O N
4TH EdITION
by Al Sweigart
San Francisco
invent your own computer games with python, 4th edition.
Copyright © 2017 by Al Sweigart.
Some rights reserved. This work is licensed under the Creative Commons Attribution-NonCommercial-
ShareAlike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/
by-nc-sa/3.0/us/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
20 19 18 17 16 1 2 3 4 5 6 7 8 9
ISBN-10: 1-59327-795-4
ISBN-13: 978-1-59327-795-6
Publisher: William Pollock
Production Editor: Laurel Chun
Cover Illustration: Josh Ellingson
Interior Design: Octopod Studios
Developmental Editor: Jan Cash
Technical Reviewer: Ari Lacenski
Copyeditor: Rachel Monaghan
Compositor: Susan Glinert Stevens
Proofreader: Paula L. Fleming
Indexer: Nancy Guenther
The sprite images in Figure 20-1 on page 302, from left to right, were created by fsvieira, przemek.sz,
LordNeo, and Suppercut. The grass sprite image in Figure 20-2 on page 302 was created by txturs. These
images have been dedicated to the public domain with a CC0 1.0 Public Domain Dedication.
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No Starch Press, Inc.
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Library of Congress Cataloging-in-Publication Data
Names: Sweigart, Al, author.
Title: Invent your own computer games with Python / by Al Sweigart.
Description: San Francisco : No Starch Press, Inc., [2017]
Identifiers: LCCN 2016037817 (print) | LCCN 2016044807 (ebook) | ISBN
9781593277956 | ISBN 1593277954 | ISBN 9781593278113 (epub) | ISBN
159327811X (epub) | ISBN 9781593278120 (mobi) | ISBN 1593278128 (mobi)
Subjects: LCSH: Computer games--Programming. | Python (Computer program
language)
Classification: LCC QA76.76.C672 S785 2017 (print) | LCC QA76.76.C672 (ebook)
| DDC 794.8/1526--dc23
LC record available at https://lccn.loc.gov/2016037817
No Starch Press and the No Starch Press logo are registered trademarks of No Starch Press, Inc. Other
product and company names mentioned herein may be the trademarks of their respective owners. Rather
than use a trademark symbol with every occurrence of a trademarked name, we are using the names only
in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the
trademark.
The information in this book is distributed on an “As Is” basis, without warranty. While every precaution
has been taken in the preparation of this work, neither the author nor No Starch Press, Inc. shall have any
liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or
indirectly by the information contained in it.
To Caro
about the author
Al Sweigart is a software developer, tech book author, and hoopy frood
who really knows where his towel is. He has written several programming
books for beginners, including Automate the Boring Stuff with Python and
Scratch Programming Playground, also from No Starch Press. His books are
freely available under a Creative Commons license at his website https://
inventwithpython.com/.
about the technical reviewer
Ari Lacenski is a developer of Android applications and Python software.
She lives in the Bay Area, where she writes about Android programming at
http://gradlewhy.ghost.io/ and mentors with Women Who Code.
Brief Contents
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Chapter 1: The Interactive Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Chapter 2: Writing Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 3: Guess the Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 4: A Joke-Telling Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 5: Dragon Realm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Chapter 6: Using the Debugger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Chapter 7: Designing Hangman with Flowcharts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Chapter 8: Writing the Hangman Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Chapter 9: Extending Hangman . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Chapter 10: Tic-Tac-Toe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Chapter 11: The Bagels Deduction Game . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Chapter 12: The Cartesian Coordinate System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Chapter 13: Sonar Treasure Hunt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Chapter 14: Caesar Cipher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Chapter 15: The Reversegam Game . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Chapter 16: Reversegam AI Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Chapter 17: Creating Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Chapter 18: Animating Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Chapter 19: Collision Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Chapter 20: Using Sounds and Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Chapter 21: A Dodger Game with Sounds and Images . . . . . . . . . . . . . . . . . . . . . . 311
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
viii Brief Contents