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Python for everybody Week 5 Quiz Answer

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Python Data Structures Week 5 Quiz Answers

Question 1)
What is wrong with this Python loop:
n = 5
while n > 0 :
        print n
print 'All done'
  • This loop will run forever
  • while is not a Python reserved word
  • There should be no colon on the while statement
  • The print ‘All done’ statement should be indented four spaces
Question 2)
What does the break statement do?
  • Exits the program
  • Resets the iteration variable to its initial value
  • Exits the currently executing loop
  • Jumps to the “top” of the loop and starts the next iteration
Question 3)
What does the continue statement do?
  • Exits the currently executing loop
  • Resets the iteration variable to its initial value
  • Jumps to the “top” of the loop and starts the next iteration
  • Exits the program
Question 4)
What does the following Python program print out?
tot = 0 
for i in [5, 4, 3, 2, 1] :
        tot = tot + 
print tot
  • 0
  • 5
  • 10
  • 15
Question 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
  • friends
  • Sally
  • Joseph
Question 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
  • Sum all the elements of a list
  • Find the smallest item in a list
  • Count all of the elements in a list
  • Compute the average of the elements in a list
Question 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
  • 3
  • 74
  • 42
Question 8)
What is a good statement to describe the is operator as used in the following if statement:
if smallest is None : 
     smallest = value
  • The if statement is a syntax error
  • matches both type and value
  • Is true if the smallest variable has a value of -1
  • Looks up ‘None’ in the smallest variable if it is a string
Question 9)
Which reserved word indicates the start of an “indefinite” loop in Python?
  • while
  • def
  • break
  • for
  • indef
Question 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
  • 5
  • 0

Week 5 Assignment

5.2 Write a program that repeatedly prompts a user for integer numbers until the user enters ‘done’.
Once ‘done’ is entered, print out the largest and smallest of the numbers.
If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number.
Enter the numbers from the book for problem 5.1 and Match the desired output as shown.

Python code…

largest = None
smallest = None
while True:
        num = raw_input("Enter a number: ")
if num == "done" : break

        num = int(num)
        print "Invalid input"

if largest is None:
        largest = num
elif largest < num:
        largest = num

if smallest is None:
        smallest = num
elif smallest > num:
        smallest = num

print "Maximum is", largest
print "Minimum is", smallest