Programming-for-Everybody--Python-/Quiz/Week 3.md

                             Programming-for-Everybody--Python-

Question 1

What do we do to a Python statement that is immediately after an if statement to indicate that the statement is to be executed only when the if statement is true?

Your Answer		Score	Explanation
Start the statement with a "#" character
Indent the line below the if statement	Correct	1.00
Underline all of the conditional code
Begin the statement with a curly brace {
Total		1.00 / 1.00

Question 2

Which of these operators is not a comparison / logical operator?

Your Answer		Score	Explanation
<
<=
>=
=	Correct	1.00
==
Total		1.00 / 1.00

Question 3

What is true about the following code segment:

if  x == 5 :
    print 'Is 5'
    print 'Is Still 5'
    print 'Third 5'

Your Answer		Score	Explanation
Depending on the value of x, either all three of the print statements will execute or none of the statements will execute	Correct	1.00
The string 'Is 5' will always print out regardless of the value for x.
The string 'Is 5' will never print out regardless of the value for x.
Only two of the three print statements will print out if the value of x is less than zero.
Total		1.00 / 1.00

Question 4

When you have multiple lines in an if block, how do you indicate the end of the if block?

Your Answer		Score	Explanation
You use a curly brace { after the last line of the if block
You de-indent the next line past the if block to the same level of indent as the original if statement	correct	1.00
You put the colon : character on a line by itself to indicate we are done with the if block
You capitalize the first letter of the line following the end of the if block
Total		1.00

Question 5

You look at the following text:

if x == 6 :
    print 'Is 6'
    print 'Is Still 6'
    print 'Third 6'

It looks perfect but Python is giving you an 'Indentation Error' on the second print statement. What is the most likely reason?

Your Answer		Score	Explanation
In order to make humans feel inadequate, Python randomly emits 'Indentation Errors' on perfectly good code - after about an hour the error will just go away without any changes to your program
Python thinks 'Still' is a mis-spelled word in the string
You have mixed tabs and spaces in the file	correct	1.00
Python has reached its limit on the largest Python program that can be run
Total		1.00

Question Explanation
Please make sure to find the option to auto-expand tabs in your text editor. Or it will be very frustrating when these errors appear in code that *looks* perfect.

Question 6

What is the Python reserved word that we use in two-way if tests to indicate the block of code that is to be executed if the logical test is false?

Your Answer		Score	Explanation
else	Correct	1.00
except
toggle
switch
Total		1.00 / 1.00

Question 7

What will the following code print out?

x = 0
if x < 2 :
    print 'Small'
elif x < 10 :
    print 'Medium'
else :
    print 'LARGE'
print 'All done'

Your Answer		Score	Explanation
Small
Medium All done
All done
Small All done	Correct	1.00
Total		1.00 / 1.00

Question 8

For the following code,

if x < 2 :
    print 'Below 2'
elif x >= 2 : 
    print 'Two or more'
else :
    print 'Something else'

What value of 'x' will cause 'Something else' to print out?

Your Answer		Score	Explanation
x = -2.0
x = 22
x = -22
This code will never print 'Something else' regardless of the value for 'x'	Correct	1.00
Total		1.00 / 1.00

Question Explanation
It will never print out because all values for 'x' are either below 2 or greater-than or equal two. So either the if or elif will print but never the else clause.

Question 9

'In the following code (numbers added) - which will be the last line to execute successfully?

(1)   astr = 'Hello Bob'
(2)   istr = int(astr)
(3)   print 'First', istr
(4)   astr = '123'
(5)   istr = int(astr)
(6)   print 'Second', istr

Your Answer		Score	Explanation
1	Correct	1.00
2
6
4
Total		1.00 / 1.00

Question 10

For the following code:

astr = 'Hello Bob'
istr = 0
try:
    istr = int(astr)
except:
    istr = -1

What will the value for istr after this code executes?

Your Answer		Score	Explanation
-1	Correct	1.00
It will be the 'Not a number' value (i.e. NaN)
9 (the number of characters in 'Hello Bob')
false
Total		1.00 / 1.00