Chapter 2

10?試題

1.?

Which of the following is a comment in Python?

# This is a test

* This is a test

/* This is a test */

// This is a test

2.?

What does the following code print out?

print "123" + "abc"

This is a syntax error because you cannot add strings

hello world

123+abc

123abc

3.?

Which of the following is a bad Python variable name?

Spam

_spam

SPAM23

23spam

4.?

Which of the following is not a Python reserved word?

iterate

continue

else

break

5.?

Assume the variable?x?has been initialized to an integer value (e.g., x = 3). What does the following statement do?

x = x + 2

This would fail as it is a syntax error

Exit the program

Increase the speed of the program by a factor of 2

Retrieve the current value for x, add two to it, and put the sum back into x

6.?

Which of the following elements of a mathematical expression in Python is evaluated first?

Parenthesis ( )

Multiplication *

Addition +

Subtraction -

7.?

What is the value of the following expression

42 % 10

Hint - the "%" is the remainder operator

10

1042

2

420

8.?

What will be the value of x after the following statement executes:

x = 1 + 2 * 3 - 8 / 4

5

8

2

4

9.?

What will be the value of x when the following statement is executed:

x = int(98.6)

98

100

99

6

10.?

What does the Python?raw_input()?function do?

Pause the program and read data from the user

Connect to the network and retrieve a web page.

Read the memory of the running program

Take a screen shot from an area of the screen

總結

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