Hackerrank Python Basics 5

Question 1

What does the `enumerate()` function return?

Accepted Answer

An iterator of (index, value) pairs

Answer

`enumerate()` yields `(index, value)` tuples as you iterate over a sequence.

Question 2

What is the result of `sorted([3, 1, 4, 1, 5], reverse=True)`?

Accepted Answer

[5, 4, 3, 1, 1]

Answer

`sorted()` with `reverse=True` returns a new list sorted in descending order.

Question 3

Which statement about Python's `is` operator is correct?

Accepted Answer

It checks identity (same object in memory)

Answer

`is` checks whether two variables point to the same object in memory, not just equal values.

Question 4

What will `[x**2 for x in range(4) if x % 2 == 0]` produce?

Accepted Answer

[0, 4]

Answer

The filter keeps only even x (0 and 2), then squares them to give [0, 4].

Question 5

Which method would you use to split a string `s` on whitespace into a list of words?

Accepted Answer

s.split()

Answer

`str.split()` with no argument splits on any whitespace and removes empty strings.

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