PCEP Data Structures 4

Question 1

What is the output of `my_list = [1,2,3]; my_list.extend([4,5]); print(my_list)`?

Accepted Answer

[1, 2, 3, 4, 5]

Answer

[1, 2, 3, [4, 5]]

Answer

[[1, 2, 3], [4, 5]]

Answer

Error

Question 2

Which of the following is a valid way to copy a list without aliasing it?

Accepted Answer

Both b and c

Answer

b = a

Answer

b = a.copy()

Answer

b = list(a)

Question 3

What does `tuple([1, 2, 3])` return?

Accepted Answer

(1, 2, 3)

Answer

[1, 2, 3]

Answer

{1, 2, 3}

Answer

Error

Question 4

What is the output of `s = {1, 1, 2, 2, 3}; print(len(s))`?

Accepted Answer

3

Answer

5

Answer

2

Answer

Error

Question 5

What does `my_dict.get('missing', 0)` return if `'missing'` is not in `my_dict`?

Accepted Answer

0

Answer

None

Answer

KeyError

Answer

False

Question 6

What is the result of `[x**2 for x in range(4)]`?

Accepted Answer

[0, 1, 4, 9]

Answer

[1, 4, 9, 16]

Answer

[0, 2, 4, 6]

Answer

[0, 1, 2, 3]

Question 7

Which of the following set operations returns elements in the first set but NOT in the second?

Accepted Answer

Difference (`-`)

Answer

Union (`|`)

Answer

Intersection (`&`)

Answer

Symmetric difference (`^`)