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Python Data Structures Week 6 Quiz Answers

Python Data Structures Week 6 Quiz Answers


Python Data Structures Week 6 Quiz Answers

Chapter Ten: Tuples


Question 1)

What is the difference between a Python tuple and Python list?

  • Lists are mutable and tuples are not mutable
  • Tuples can be expanded after they are created and lists cannot
  • Lists maintain the order of the items and tuples do not maintain order
  • Lists are indexed by integers and tuples are indexed by strings



Question 2)

Which of the following methods work both in Python lists and Python tuples?

  • reverse()
  • append()
  • index()
  • pop()
  • sort()


Question 3)

What will end up in the variable y after this code is executed?

x , y = 3, 4


  • A two item tuple
  • 3
  • A two item list
  • 4
  • A dictionary with the key 3 mapped to the value 4


Question 4)

In the following Python code, what will end up in the variable y?

x = { ‘chuck’ : 1 , ‘fred’ : 42, ‘jan’: 100}

y = x.items


  • A list of tuples
  • A list of integers
  • A list of strings
  • A tuple with three integers


Question 5)

Which of the following tuples is greater than x in the following Python sequence?


x = (5, 1, 3)

if ??? > x :  

 …


  • (6, 0, 0)
  • (5, 0, 300)
  • (4, 100, 200)
  • (0, 1000, 2000)



Question 6)

What does the following Python code accomplish, assuming the c is a non-empty dictionary?


tmp = list()

for k, v in c.items() :    

tmp.append( (v, k) )


  • It sorts the dictionary based on its key values
  • It creates a list of tuples where each tuple is a value, key pair
  • It computes the average of all of the values in the dictionary
  • It computes the largest of all of the values in the dictionary



Question 7)

If the variable data is a Python list, how do we sort it in reverse order?

  • data = data.sort(-1)
  • data.sort.reverse()
  • data = sortrev(data)
  • data.sort(reverse=True)


Question 8)

Using the following tuple, how would you print ‘Wed’?

days = (‘Mon’, ‘Tue’, ‘Wed’, ‘Thu’, ‘Fri’, ‘Sat’, ‘Sun’)


  • print(days[1])
  • print(days(2))
  • print(days[2])
  • print[days(2)]
  • print(days.get(1,-1))
  • print(days{2})


Question 9)

In the following Python loop, why are there two iteration variables (k and v)?

c = {‘a’:10, ‘b’:1, ‘c’:22}

for k, v in c.items() :   

 …


  • Because there are two items in the dictionary
  • Because the keys for the dictionary are strings
  • Because for each item we want the previous and current key
  • Because the items() method in dictionaries returns a list of tuples


Question 10)

Given that Python lists and Python tuples are quite similar – when might you prefer to use a tuple over a list?

  • For a list of items you intend to sort in place
  • For a list of items that will be extended as new items are found
  • For a temporary variable that you will use and discard without modifying
  • For a list of items that want to use strings as key values instead of integers