Python Coding challenge - Day 663| What is the output of the following Python Code?

 

1. Importing the NumPy library

import numpy as np

Imports the NumPy library as np for numerical computations and array manipulations.

2. Creating a NumPy array arr

arr = np.array([10, 20, 30, 40])

Creates a NumPy array named arr with elements [10, 20, 30, 40].

3. Creating a boolean mask to select elements greater than 15

mask = arr > 15

Compares each element of arr to 15 and creates a boolean array mask:

For 10 → False

For 20 → True

For 30 → True

For 40 → True

So, mask = [False, True, True, True].

4. Assigning the value 5 to elements of arr where mask is True

arr[mask] = 5

Uses boolean indexing to update elements of arr where mask is True.

Elements at indices 1, 2, and 3 (values 20, 30, 40) are replaced with 5.

Updated arr becomes [10, 5, 5, 5].

5. Calculating and printing the sum of updated arr

print(np.sum(arr))

Calculates the sum of the updated array arr:

10 + 5 + 5 + 5 = 25

Prints 25.

Final output:

25

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