Python Data Structures - Chapter 10 Quiz

Question 1

1
point

1. Question 1

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

Lists are mutable and tuples are not mutable

Lists maintain the order of the items and tuples do not maintain order

Lists are indexed by integers and tuples are indexed by strings

Tuples can be expanded after they are created and lists cannot

Question 2

1
point

2. Question 2

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

append()

reverse()

sort()

pop()

index()

Question 3

1
point

3. Question 3

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

1







x , y = 3, 4

A two item list

3

A two item tuple

4

A dictionary with the key 3 mapped to the value 4

Question 4

1
point

4. Question 4

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

1

2







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



y = x.items()

A list of tuples

A list of strings

A tuple with three integers

A list of integers

Question 5

1
point

5. Question 5

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

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2

3







x = (5, 1, 3)



if ??? > x :



   ...

(5, 0, 300)

(4, 100, 200)

(6, 0, 0)

(0, 1000, 2000)

Question 6

1
point

6. Question 6

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

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2

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tmp = list()



for k, v in c.items() :



    tmp.append( (v, k) )

It computes the average of all of the values in the dictionary

It computes the largest of all of the values in the dictionary

It creates a list of tuples where each tuple is a value, key pair

It sorts the dictionary based on its key values

Question 7

1
point

7. Question 7

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

data.sort.reverse()

data.sort(reverse=True)

data = data.sort(-1)

data = sortrev(data)

Question 8

1
point

8. Question 8

Using the following tuple, how would you print 'Wed'?

1







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

print(days.get(1,-1))

print(days[2])

print(days[1])

print(days(2))

print(days{2})

print[days(2)]

Question 9

1
point

9. Question 9

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

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2

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c = {'a':10, 'b':1, 'c':22}



for k, v in c.items() :



    ...

Because for each item we want the previous and current key

Because the keys for the dictionary are strings

Because the items() method in dictionaries returns a list of tuples

Because there are two items in the dictionary

Question 10

1
point

10. 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 that want to use strings as key values instead of integers

For a list of items you intend to sort in place

For a temporary variable that you will use and discard without modifying

For a list of items that will be extended as new items are found