Python核心编程第二版附录A

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2025-03-03 1 0 336.13KB 10 页 5.9玖币

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1011

Answers to Selected Exercises

Chapter 2

5. Loops and numbers

i = 0

while

i < 11:

i += 1

for

range(11):

pass

6. Conditionals

n = int(raw_input('enter a number: '))

n < 0:

'negative'

elif

n > 0:

'positive'

else

'zero'

Chun_AppA.fm Page 1011 Wednesday, August 23, 2006 5:19 PM

1012 Appendix A

7. Loops and strings

s = raw_input('enter a string: ')

for

eachChar

eachChar # (does not print index)

for

range(len(s)):

i, s[i]

i = 0

slen = len(s)

while

i < slen:

i, s[i]

for

i, x

enumerate(s):

i, x

8. Loops and operators

subtot = 0

for

range(5):

subtot += int(raw_input('enter a number: '))

subtot

# uses sum() BIF and generator expressions

sum(int(raw_input('enter a number: '))

for

range(5))

Chapter 3

4. Statements

Use

;

5. Statements

Use

(unless part of a comma-separated sequence in which case

is optional)

7. Identiﬁers

40XL

number

$saving$

symbol

keyword

0x40L

number

big-daddy

symbol

2hot2touch

number

thisIsn'tAVar

symbol

keyword

counter-1

symbol

Chun_AppA.fm Page 1012 Wednesday, August 23, 2006 5:19 PM

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摘要：

1011AnswerstoSelectedExercisesChapter25.Loopsandnumbersa)i=0whilei<11:i+=1b)foriinrange(11):pass6.Conditionalsn=int(raw_input('enteranumber:'))ifn<0:print'negative'elifn>0:print'positive'else:print'zero'Chun_AppA.fmPage1011Wednesday,August23,20065:19PM1012AppendixA7.Loopsandstringss=raw_input('enter...

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