Python Coding Challenge - Question with Answer (ID -200426)

 

Explanation:

1. Creating the Data Structure

data = [[1, 2], [3, 4]]

data is a list.

Inside it, there are two smaller lists:

First list: [1, 2]

Second list: [3, 4]

So, this is a 2D list (list of lists), similar to a table:

[

  [1, 2],   → index 0

  [3, 4]    → index 1

]

2. Understanding Indexing

Python uses zero-based indexing, meaning:

First element → index 0

Second element → index 1

So:

data[0] → [1, 2]

data[1] → [3, 4]

3. Accessing Nested Elements

data[1][0]

Break it step by step:

Step 1: data[1]

Selects the second list

Result: [3, 4]

Step 2: [3, 4][0]

Selects the first element of that list

Result: 3

4. Final Output

print(data[1][0])

Prints the value:

3

Book: CREATING GUIS WITH PYTHON