ThinkPython - (EPUB全文下载)

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Think Python
Allen B. Downey
Published by O’Reilly Media
Beijing ⋅ Cambridge ⋅ Farnham ⋅ Köln ⋅ Sebastopol ⋅ Tokyo

Preface

The Strange History of This Book
In January 1999 I was preparing to teach an introductory programming class in Java. I had taught it three times and I was getting frustrated. The failure rate in the class was too high and, even for students who succeeded, the overall level of achievement was too low.
One of the problems I saw was the books. They were too big, with too much unnecessary detail about Java, and not enough high-level guidance about how to program. And they all suffered from the trap door effect: they would start out easy, proceed gradually, and then somewhere around Chapter 5 the bottom would fall out. The students would get too much new material, too fast, and I would spend the rest of the semester picking up the pieces.
Two weeks before the first day of classes, I decided to write my own book. My goals were:
Keep it short. It is better for students to read 10 pages than not read 50 pages.
Be careful with vocabulary. I tried to minimize the jargon and define each term at first use.
Build gradually. To avoid trap doors, I took the most difficult topics and split them into a series of small steps.
Focus on programming, not the programming language. I included the minimum useful subset of Java and left out the rest.
I needed a title, so on a whim I chose
How to Think Like a Computer Scientist

.
My first version was rough, but it worked. Students did the reading, and they understood enough that I could spend class time on the hard topics, the interesting topics and (most important) letting the students practice.
I released the book under the GNU Free Documentation License, which allows users to copy, modify, and distribute the book.
What happened next is the cool part. Jeff Elkner, a high school teacher in Virginia, adopted my book and translated it into Python. He sent me a copy of his translation, and I had the unusual experience of learning Python by reading my own book. As Green Tea Press, I published the first Python version in 2001.
In 2003 I started teaching at Olin College and I got to teach Python for the first time. The contrast with Java was striking. Students struggled less, learned more, worked on more interesting projects, and generally had a lot more fun.
Over the last nine years I continued to develop the book, correcting errors, improving some of the examples and adding material, especially exercises ............

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