Python Coding Challenge - Question with Answer (ID -270426)

 

Explanation:

🔹 1. Creating the List

x = [[1]*2]*2

👉 Break it step by step:

[1]*2 → creates [1, 1]

[[1]*2]*2 → creates two references to the SAME inner list

So it becomes:

x = [[1, 1], [1, 1]]

⚠️ Important:

Both inner lists are not separate — they point to the same memory object

🔹 2. Modifying an Element

x[1][1] = 9

👉 This means:

Go to 2nd row (x[1])

Change 2nd element ([1]) → set to 9

But since both rows are the same object, the change affects BOTH rows

🔹 3. Printing the List

print(x)

👉 Output becomes:

[[1, 9], [1, 9]]

100 Python Automation Projects for Smart Developers