Chapter 5

10?試題

1.?

What is wrong with this Python loop:

n = 5 while n > 0 :print n print 'All done'

This loop will run forever

The?print 'All done'?statement should be indented four spaces

There should be no colon on the?while?statement

while?is not a Python reserved word

2.?

What does the?break?statement do?

Jumps to the "top" of the loop and starts the next iteration

Exits the currently executing loop

Exits the program

Resets the iteration variable to its initial value

3.?

What does the?continue?statement do?

Exits the program

Jumps to the "top" of the loop and starts the next iteration

Resets the iteration variable to its initial value

Exits the currently executing loop

4.?

What does the following Python program print out?

tot = 0 for i in [5, 4, 3, 2, 1] :tot = tot + 1 print tot

5

0

15

10

5.?

What is the?iteration?variable in the following Python code:

friends = ['Joseph', 'Glenn', 'Sally'] for friend in friends :print 'Happy New Year:', friend print 'Done!'

friend

Glenn

Sally

friends

6.?

What is a good description of the following bit of Python code?

zork = 0 for thing in [9, 41, 12, 3, 74, 15] :zork = zork + thing print 'After', zork

Compute the average of the elements in a list

Find the smallest item in a list

Sum all the elements of a list

Count all of the elements in a list

7.?

What will the following code print out?

smallest_so_far = -1 for the_num in [9, 41, 12, 3, 74, 15] :if the_num < smallest_so_far :smallest_so_far = the_num print smallest_so_far

Hint: This is a trick question and most would say this code has a bug - so read carefully

-1

74

42

3

8.?

What is a good statement to describe the?is?operator as used in the following if statement:

if smallest is None :smallest = value

Is true if the?smallest?variable has a value of -1

matches both type and value

The if statement is a syntax error

Looks up 'None' in the?smallest?variable if it is a string

9.?

Which reserved word indicates the start of an "indefinite" loop in Python?

indef

while

break

for

def

10.?

How many times will the body of the following loop be executed?

n = 0 while n > 0 :print 'Lather'print 'Rinse' print 'Dry off!'

0

This is an infinite loop

5

1

總結

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