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

`extend()` adds each element of the iterable individually to the list.

Question 2

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

Accepted Answer

Both b and c

Answer

Both `.copy()` and `list()` create a new shallow copy of the list.

Question 3

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

Accepted Answer

(1, 2, 3)

Answer

`tuple()` converts any iterable into a tuple.

Question 4

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

Accepted Answer

3

Answer

Sets store only unique elements, so duplicates are automatically removed.

Question 5

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

Accepted Answer

0

Answer

The `get()` method returns the default value (second argument) when the key is absent.

(PCEP) Certified Entry-Level Python Programmer Practice Test