chapter 5 week 7 quiz

chapter 5 week 7 quiz

Quiz

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1. What is wrong with this Python loop:
   n = 5
   while n > 0 :
   print(n)
   print('All done')
   1.   This loop will run forever
   2.   The print('All done') statement should be indented four spaces
   3.   There should be no colon on the while statement
   4.   while is not a Python reserved word
2. What does the break statement do?
   
   1.   Exits the program
   2.   Exits the currently executing loop
   3.   Resets the iteration variable to its initial value
   4.   Jumps to the "top" of the loop and starts the next iteration
3. What does the continue statement do?
   
   1.   Exits the program
   2.   Jumps to the "top" of the loop and starts the next iteration
   3.   Exits the currently executing loop
   4.   Resets the iteration variable to its initial value
4. What does the following Python program print out?
   tot = 0
   for i in [5, 4, 3, 2, 1] :
   tot = tot + 1
   print(tot)
   1.   15
   2.   10
   3.   5
   4.   0
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!')
   1.   friend
   2.   Glenn
   3.   Sally
   4.   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)
   1.   Find the smallest item in a list
   2.   Count all of the elements in a list
   3.   Sum all the elements of a list
   4.   Find the largest item 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.   -1
   2.   74
   3.   42
   4.   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
   1.   Is true if the smallest variable has a value of -1
   2.   The if statement is a syntax error
   3.   Looks up 'None' in the smallest variable if it is a string
   4.   matches both type and value
9. Which reserved word indicates the start of an "indefinite" loop in Python?
   
   1.   for
   2.   break
   3.   while
   4.   def
   5.   indef
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!')
    1.   0
    2.   This is an infinite loop
    3.   5
    4.   1