Python编程：软件设计基础

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"《Python for Software Design》是Allen B. Downey所著的一本软件设计入门书籍，旨在向没有编程经验的读者介绍Python编程语言，从而引导他们掌握软件设计的基本概念。书中从最基础的编程概念开始，逐步引入更复杂的主题，如递归和面向对象编程，这些难点被分解成一系列小步骤，分散在多个章节中进行讲解。作者强调编程过程，特别是调试技巧，书中的练习和项目丰富多样，使学生有机会充分实践每个新学到的概念。该书的配套资源包括习题解答、代码示例以及一套名为Swampy的Python程序库，这些资源可以在thinkpython.com网站上找到。作者Allen B. Downey博士是美国马萨诸塞州奥林工程学院的计算机科学副教授，他曾在韦尔斯利学院、科利比学院和加州大学伯克利分校任教，并拥有加州大学伯克利分校的计算机科学博士学位和硕士学位。" 《Python for Software Design》这本书的核心知识点包括： 1. **Python基础知识**：涵盖了Python编程的基础，如变量、数据类型（整型、浮点型、字符串、列表、元组、字典等）、流程控制（条件语句、循环结构）、函数定义与调用等。 2. **软件设计原则**：讲解了如何设计清晰、可读性强的代码，包括模块化、封装、抽象等基本软件工程概念。 3. **递归**：深入浅出地介绍了递归的概念，如何定义递归函数，以及如何避免无限递归问题。 4. **面向对象编程**：解释了类和对象的概念，继承、多态和封装等面向对象编程的关键特性，并通过实例帮助初学者理解如何使用这些概念。 5. **调试技术**：强调了调试在编程过程中的重要性，教给读者如何识别和修复错误，提高代码质量。 6. **实践项目**：书中的练习和项目旨在让读者将理论知识应用到实际，通过编写程序来巩固学习，提升编程技能。 7. **Swampy程序库**：这是一个用于教学的Python程序集，辅助读者进行练习，增强对Python编程的理解。通过这本书的学习，读者不仅能够掌握Python编程语言，还能建立起良好的软件设计思维，为未来更深入的编程学习和实际项目开发打下坚实的基础。

xiv Preface

■ Courtney Gleason and Katherine Smith wrote horsebet.py, which was used as

a case study in an earlier version of the book. Their program can now be found

on the website.

■ Lee Harr submitted more corrections than we have room to list here, and indeed

he should be listed as one of the principal editors of the text.

■ James Kaylin is a student using the text. He has submitted numerous corrections.

■ David Kershaw ﬁxed the broken catTwice function in Section 3.10.

■ Eddie Lam has sent in numerous corrections to Chapters 1, 2, and 3. He also

ﬁxed the Makeﬁle so that it creates an index the ﬁrst time it is run and helped us

set up a versioning scheme.

■ Man-Yong Lee sent in a correction to the example code in Section 2.4.

■ David Mayo pointed out that the word “unconsciously” in Chapter 1 needed to

be changed to “subconsciously.”

■ Chris McAloon sent in several corrections to Sections 3.9 and 3.10.

■ Matthew J. Moelter has been a long-time contributor who sent in numerous

corrections to and suggestions for the book.

■ Simon Dicon Montford reported a missing function deﬁnition and several typos

in Chapter 3. He also found errors in the increment function in Chapter 13.

■ John Ouzts corrected the deﬁnition of “return value” in Chapter 3.

■ Kevin Parks sent in valuable comments and suggestions as to how to improve the

distribution of the book.

■ David Pool sent in a typo in the glossary of Chapter 1, as well as kind words of

encouragement.

■ Michael Schmitt sent in a correction to the chapter on ﬁles and exceptions.

■ Robin Shaw pointed out an error in Section 13.1, where the printTime function

was used in an example without being deﬁned.

■ Paul Sleigh found an error in Chapter 7 and a bug in Jonah Cohen’s Perl script

that generates HTML from LaTeX.

■ Craig T. Snydal is testing the text in a course at Drew University. He has

contributed several valuable suggestions and corrections.

■ Ian Thomas and his students are using the text in a programming course. They

are the ﬁrst ones to test the chapters in the latter half of the book, and they have

made numerous corrections and suggestions.

■ Keith Verheyden sent in a correction in Chapter 3.

■ Peter Winstanley let us know about a longstanding error in our Latin in Chapter 3.

■ Chris Wrobel made corrections to the code in the chapter on ﬁle I/O and

exceptions.

■ Moshe Zadka has made invaluable contributions to this project. In addition

to writing the ﬁrst draft of the chapter on dictionaries, he provided continual

guidance in the early stages of the book.

■ Christoph Zwerschke sent several corrections and pedagogic suggestions and

explained the difference between gleich and selbe.

■ James Mayer sent us a whole slew of spelling and typographical errors, including

two in the contributor list.

■

Hayden McAfee caught a potentially confusing inconsistency between two

examples.

Preface xv

■ Angel Arnal is part of an international team of translators working on the Spanish

version of the text. He has also found several errors in the English version.

■ Tauhidul Hoque and Lex Berezhny created the illustrations in Chapter 1 and

improved many of the other illustrations.

■ Dr. Michele Alzetta caught an error in Chapter 8 and sent some interesting

pedagogic comments and suggestions about Fibonacci and Old Maid.

■ Andy Mitchell caught a typo in Chapter 1 and a broken example in Chapter 2.

■ Kalin Harvey suggested a clariﬁcation in Chapter 7 and caught some typos.

■ Christopher P. Smith caught several typos and is helping us prepare to update

the book for Python 2.2.

■ David Hutchins caught a typo in the Preface.

■ Gregor Lingl is teaching Python at a high school in Vienna, Austria. He is working

on a German translation of the book, and he caught a couple of bad errors in

Chapter 5.

■ Julie Peters caught a typo in the Preface.

■ Florin Oprina sent in an improvement in makeTime, a correction in printTime,

and a nice typo.

■ D. J. Webre suggested a clariﬁcation in Chapter 3.

■ Ken found a ﬁstful of errors in Chapters 8, 9, and 11.

■ Ivo Wever caught a typo in Chapter 5 and suggested a clariﬁcation in Chapter 3.

■ Curtis Yanko suggested a clariﬁcation in Chapter 2.

■ Ben Logan sent in a number of typos and problems with translating the book into

HTML.

■ Jason Armstrong saw a missing word in Chapter 2.

■ Louis Cordier noticed a spot in Chapter 16 where the code didn’t match the text.

■ Brian Cain suggested several clariﬁcations in Chapters 2 and 3.

■ Rob Black sent in a passel of corrections, including some changes for Python 2.2.

■ Jean-Philippe Rey at Ecole Centrale Paris sent a number of patches, including

some updates for Python 2.2 and other thoughtful improvements.

■ Jason Mader at George Washington University made a number of useful

suggestions and corrections.

■ Jan Gundtofte-Bruun reminded us that “a error” is an error.

■ Abel David and Alexis Dinno reminded us that the plural of “matrix” is “matri-

ces,” not “matrixes.” This error was in the book for years, but two readers with

the same initials reported it on the same day. Weird.

■ Charles Thayer encouraged us to get rid of the semi-colons we had put at the ends

of some statements and to clean up our use of “argument” and “parameter.”

■ Roger Sperberg pointed out a twisted piece of logic in Chapter 3.

■ Sam Bull pointed out a confusing paragraph in Chapter 2.

■ Andrew Cheung pointed out two instances of “use before def.”

■ C. Corey Capel spotted a missing word in the Third Theorem of Debugging and

a typo in Chapter 4.

■ Alessandra helped clear up some Turtle confusion.

■ Wim Champagne found a brain-o in a dictionary example.

■

Douglas Wright pointed out a problem with ﬂoor division in arc.

■

Jared Spindor found some jetsam at the end of a sentence.

■ Lin Peiheng sent a number of very helpful suggestions.

xvi Preface

■ Ray Hagtvedt sent in two errors and a not-quite-error.

■ Torsten Hübsch pointed out an inconsistency in Swampy.

■ Inga Petuhhov corrected an example in Chapter 14.

■ Arne Babenhauserheide sent several helpful corrections.

■ Mark E. Casida is is good at spotting repeated words.

■ Scott Tyler ﬁlled in a that was missing. And then sent in a heap of corrections.

■ Gordon Shephard sent in several corrections, all in separate emails.

■ Andrew Turner spotted an error in Chapter 8.

■ Adam Hobart ﬁxed a problem with ﬂoor division in arc.

■ Daryl Hammond and Sarah Zimmerman pointed out that I served up math.pi

too early. And Zim spotted a typo.

■ George Sass found a bug in a Debugging section.

■ Brian Bingham suggested Exercise 11.9.

■ Leah Engelbert-Fenton pointed out that I used tuple as a variable name, contrary

to my own advice. And then found a bunch of typos and a “use before def.”

■ Joe Funke spotted a typo.

■ Chao-chao Chen found an inconsistency in the Fibonacci example.

■ Jeff Paine knows the difference between space and spam.

■ Lubos Pintes sent in a typo.

■ Gregg Lind and Abigail Heithoff suggested Exercise 14.6.

■ Max Hailperin has sent in a number of corrections and suggestions. Max is one

of the authors of the extraordinary Concrete Abstractions, which you might want

to read when you are done with this book.

■ Chotipat Pornavalai found an error in an error message.

■ Stanislaw Antol sent a list of very helpful suggestions.

■ Eric Pashman sent a number of corrections for Chapters 4–11.

■ Miguel Azevedo found some typos.

■ Jianhua Liu sent in a long list of corrections.

■ Nick King found a missing word.

■ Martin Zuther sent a long list of suggestions.

■ Adam Zimmerman found an inconsistency in my instance of an “instance” and

several other errors.

■ Ratnakar Tiwari suggested a footnote explaining degenerate triangles.

■ Anurag Goel suggested another solution for is_abecedarian and sent some

additional corrections. And he knows how to spell Jane Austen.

■ Kelli Kratzer spotted one of they typos.

■ Mark Grifﬁths pointed out a confusing example in Chapter 3.

■ Roydan Ongie found an error in my Newton’s method.

■ Patryk Wolowiec helped me with a problem in the HTML version.

Allen B. Downey

Needham, MA

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