Python Coding Challenge - Question with Answer (ID -200626)

 

Code Explanation:

Line 1: Creating a List

x = [1, 2, 3, 4]

x is a variable.

[1, 2, 3, 4] is a list containing 4 elements.

The elements are stored in the following positions (indexes):

Index Value

0             1

1             2

2             3

3                4

Python also supports negative indexing:

Negative Index Value

-1                             4

-2                             3

-3                             2

-4                             1

Line 2: Accessing an Element

print(x[-2])

Step 1

x[-2] means:

Start counting from the end of the list.

-1 refers to the last element → 4

-2 refers to the second-last element → 3

So:

x[-2]

becomes:

3

Step 2

print() displays the value on the screen.

print(3)

Output

3

Book: 100 Python Projects — From Beginner to Expert