提升编程技巧：《良好编码习惯：Python实例》

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"《善习铸就卓越编码：Python实例提升编程技能》(Good Habits for Great Coding)是一本由Michael Stueben撰写的实用指南，旨在帮助读者提升他们的编程技艺，特别是通过实践来培养良好的编程习惯。本书并非初级教程，而是假定读者已经掌握了基础编程知识，专注于提供一系列经过时间检验的最佳实践。这些实践包括但不限于代码风格、设计原则、文档编写、测试策略、重构技巧等关键领域。作者通过丰富的Python示例，引导读者理解和应用这些良好习惯，以提高代码的可读性和可维护性。每一部分都深入浅出，旨在让读者在实际项目中逐渐养成高效编程的习惯。书中还强调版权法的重要性，明确指出所有内容受版权保护，禁止任何形式的复制、传播或未经许可的改编。《善习铸就卓越编码》不仅是一本技术书籍，也是一份关于职业素养和持续学习的指南，适合任何希望在IT行业中不断进步的专业人士。通过遵循书中的原则，读者不仅可以提升个人技术水平，还能提高团队协作效率，推动项目的成功实施。如果你是一名开发者，无论是经验丰富的老手还是初学者，这本书都将是你提升编程质量和个人成长的重要资源。" 此书不仅提供了实用的技术指导，而且强调了编程中的软技能，如代码组织、沟通和自我更新，这些都是在现代IT行业中不可或缺的素质。通过阅读和实践书中的内容，读者可以形成一套自己的编码习惯，从而在职业生涯中不断取得成功。

xix

You might try to write this function now, in your own preferred

language. The hills make us strong, as they say in cycling. But you may be

too busy, and the exercise probably seems both complex and pointless.

Who would want such a function anyway? But in a situation we will see

later, this binary-jumping type of multiplication will significantly speed up

a function. So for the time being I will give you a pass in writing

this algorithm. My eight-line solution follows. Python, of course, has

built-in features to change an integer into a binary string and to reverse the

characters in a string. No wonder people like to code in Python.

def powr(b, exp):

binStng = str(bin(exp))[2:] # Change integer exp to a

binary string.

revStng = reversed(binStng) # Reverse the digits (alt. =

binStng[::-1]).

product = 1

for ch in revStng:

if ch == '1':

product *= b

b *= b

return product

If you don’t know Python, the first two lines will be a mystery, hence

the comments. If you do know Python, you still may learn something new

and useful in those two lines. The loop should be clear to anyone who has

worked with for loops.

I’ve been programming for nearly four decades, and had written a

variation of this function about a month previously. Nevertheless, it took

me nine runs to get this function working. (I had placed b *= b above

the if statement, and it took me a while to realize the order mattered.)

I mention this to make the point that most programmers, certainly the

author, fail to write correct code in the first few attempts.

INTRODUCTIONINTRODUCTION

xxii

readable code with mine. Imagine we are the last two candidates for a

summer coding job. The interviewer gives us the following assignment:

QUIZ 3. If I take a 52-card deck and I shuffle it well, then what is the

probability that at least one card remains in place?

Solve this problem by

computer simulation

(here, sampling) in your favorite language. That is,

shuffle 1,000,000 sorted arrays and determine what percentage of them

have at least one element remaining in place. Express this number as a

probability. Be sure to make your code as readable as possible. Bring me

your code tomorrow morning. I’ll have one of our programmers look at

your two programs and tell me whose code he prefers.

Quiz 3 is the most important quiz in this book. If you attempt no other

problem in this book, try to write this short program—and a complete

program is expected, not just a function. My code follows, with notes as

to why I made some design decisions. Before you compare your code to

mine, what can you tell me about the programmer who will judge our

code? My answer is in the footnote.

How would you answer this interview question: “So, what will you do

this summer if you don’t get this job?” My suggested answer-to-impress is

in the footnote.

This is known as Montmort’s Matching Problem. See Isaac Todhunter, Theory of

Probability (London: Macmillan, 1865), (Chelsea Reprint, 1965), page 91 (online).

Curiously, for a deck of any number of cards greater than 5 the answer is almost

the same.

Tech. Note. Wikipedia states that a computer model is the set of algorithms

capturing the essence of a process or system, and that a computer simulation is

the running of those algorithms. That being said, the terms simulation and model

are often interchanged in both writing and speaking. Random sampling to obtain

numerical approximations by ratios is called the Monte Carlo Method.

He wants someone who pays attention to detail, who has some maturity in

his/her coding skills, and who wants this job so much that the candidate will try

to impress the code reviewer. Will your code show this?

“I’ll have to go back to reading computer books and working problems on my

own. I would much rather gain some experience this summer by working in

industry.”

INTRODUCTIONINTRODUCTION

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提升编程技巧：《良好编码习惯：Python实例》

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