PCEP Data Structures 3

Question 1

What does `'key' in {'key': 1, 'val': 2}` evaluate to?

Accepted Answer

True

Answer

The `in` operator checks for key membership in a dictionary.

Question 2

Which list method inserts an element at a specific index?

Accepted Answer

insert()

Answer

`insert(index, value)` places a new element before the given index.

Question 3

What is the value of `d` after `d = {}; d['x'] = 10; d['x'] += 5`?

Accepted Answer

{'x': 15}

Answer

The key `'x'` is first set to 10, then incremented by 5 to become 15.

Question 4

What does `sorted({3, 1, 2})` return?

Accepted Answer

[1, 2, 3]

Answer

`sorted()` always returns a new list, regardless of the input type.

Question 5

What is the output of `[0] * 4`?

Accepted Answer

[0, 0, 0, 0]

Answer

Multiplying a list by an integer repeats its elements that many times.

(PCEP) Certified Entry-Level Python Programmer Practice Test