Python Coding Challange - Question with Answer (01011025)

 

Step-by-Step Explanation:

Initialization:

nums = [1, 2, 3, 4, 5]

We create a list nums with elements [1, 2, 3, 4, 5].

Appending a list:

nums.append([6, 7])

append adds the entire object as a single element at the end.

Now nums becomes: [1, 2, 3, 4, 5, [6, 7]].

Extending with a list:

nums.extend([8, 9])

extend adds each element individually to the list.

So the list now becomes: [1, 2, 3, 4, 5, [6, 7], 8, 9].

Printing length and last elements:

print(len(nums), nums[-3:])

len(nums) → 8 (total elements in the list).

nums[-3:] → last three elements: [[6, 7], 8, 9]

Final Output:

8 [[6, 7], 8, 9]

Key Concept:

append vs extend:

append adds the whole object as one element.

extend adds each element individually.

Using negative indexing nums[-3:] is a quick way to access the last n elements of a list.

BIOMEDICAL DATA ANALYSIS WITH PYTHON