Python coding challenge - Day 4 | Output Prediction MCQ

What Is the Output of This Python Code?

Question :

x = [1, 2, 3, 4]

print(x[-1])

Options :

A) 1

B) 3

C) 4

D) Error

Correct Answer :

C) 4

Explanation :

First we create a list :

x = [1, 2, 3, 4]

The list contains 4 elements

Index positions :

Index :   0   1   2   3

Value :   1   2   3   4

Step 1 - Negative indexing 

In python we can access elements form the end of the list using negative indexing.

-1 → last element  

-2 → second last element  

-3 → third last element

So the list looks like this :

Index :   0   1   2   3

Value :   1   2   3   4

Negative Index :

-4  -3  -2  -1

Step 2 - Accessing the element

print(x[-1])

-1 refers to the last element of the list. 

So python prints :

4

output :

4

key points :

Negative indexing allows accessing list elements form the end of the list.

Example :

x[-1] → last element

x[-2] → second last element

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