Python Core Syntax 3

Question 1

What will `x = [1, 2, 3]; print(x[-1])` output?

Accepted Answer

3

Answer

Negative indexing in Python counts from the end; `-1` refers to the last element, which is `3`.

Question 2

Which of the following correctly unpacks a tuple `t = (10, 20, 30)` into three variables?

Accepted Answer

a, b, c = t

Answer

Tuple unpacking with `a, b, c = t` assigns each element to a corresponding variable in order.

Question 3

What is the purpose of the `pass` statement in Python?

Accepted Answer

Acts as a placeholder where syntax requires a statement

Answer

`pass` is a null operation used as a syntactic placeholder when a block is required but no action is needed.

Question 4

What does `print(10 % 3)` output?

Accepted Answer

1

Answer

The `%` modulus operator returns the remainder of divison; `10 % 3` is `1` because `10 = 3*3 + 1`.

Question 5

Which of the following is the correct way to write a single-line conditional expression (ternary) in Python?

Accepted Answer

x = 1 if cond else 2

Answer

Python's ternary expression uses the syntax `value_if_true if condition else value_if_false`.

Python Practice Test