Quiz: Chapter 10 :Python Data Structures (Python for Everybody Specialization) Answers 2025

Question 1

What is the difference between a Python tuple and a Python list?
✅ Lists are mutable and tuples are not mutable
❌ Tuples can be expanded
❌ Lists use integers and tuples use strings
❌ Tuples don’t maintain order

🧠 Explanation:

• Lists → mutable (can be changed)

• Tuples → immutable (cannot be modified after creation)

Question 2

Which method works for both lists and tuples?
✅ index()
❌ append()
❌ sort()
❌ pop()
❌ reverse()

🧠 Explanation:
Tuples are immutable, so they don’t support methods that modify them.
Only index() (and count()) work on both since they don’t change data.

Question 3

What will end up in y after this code?

✅ 4
❌ 3
❌ Two-item tuple
❌ Dictionary
❌ List

🧠 Explanation:
This is tuple unpacking — x = 3, y = 4.

Question 4

In this code:

✅ A list of tuples
❌ Tuple of integers
❌ List of integers
❌ List of strings

🧠 Explanation:
.items() returns something like:
[('chuck', 1), ('fred', 42), ('jan', 100)]

Question 5

Which tuple is greater than x = (5, 1, 3)?
✅ (6, 0, 0)
❌ (0, 1000, 2000)
❌ (4, 100, 200)
❌ (5, 0, 300)

🧠 Explanation:
Tuple comparison is lexicographic — it compares elements left to right.
Since 6 > 5, (6,0,0) > (5,1,3).

Question 6

What does this code do?

✅ Creates a list of tuples where each tuple is a (value, key) pair
❌ Computes largest value
❌ Computes average
❌ Sorts dictionary

🧠 Explanation:
It swaps key/value order — often used for sorting by value later.

Question 7

How do we sort a list in reverse order?
✅ data.sort(reverse=True)
❌ data = data.sort(-1)
❌ data.sort.reverse()
❌ data = sortrev(data)

🧠 Explanation:
list.sort(reverse=True) sorts in descending order, in place.

Question 8

How would you print ‘Wed’?

✅ print(days[2])
❌ print(days[1])
❌ print(days.get(1, -1))
❌ print(days(2))

🧠 Explanation:
Tuple indices start at 0 → index 2 = “Wed”.

Question 9

Why are there two variables (k and v) here?

✅ Because the items() method returns a list of tuples (key, value)
❌ Because dictionary keys are strings
❌ Because there are two items
❌ Because we need previous and current key

🧠 Explanation:
Each iteration unpacks a (key, value) pair from .items().

Question 10

When might you prefer a tuple over a list?
✅ For a temporary variable that you will use and discard without modifying
❌ For extending lists
❌ For string-keyed data (use dict)
❌ For in-place sorting

🧠 Explanation:
Use tuples when data is fixed and you want performance + immutability.

🧾 Summary Table