Python Coding challenge - Day 662| What is the output of the following Python Code?

Code Explanation:

1. Importing the NumPy library

import numpy as np

Imports the NumPy library as np for numerical operations and array handling.

2. Creating a NumPy array arr

arr = np.array([1, 2, 3, 4, 5])

Creates a NumPy array named arr with elements [1, 2, 3, 4, 5].

3. Creating a list of indices idx

idx = [0, 2, 4]

Creates a Python list idx containing indices [0, 2, 4].

These indices correspond to elements in arr at positions 0, 2, and 4.

4. Indexing arr with idx to create new_arr

new_arr = arr[idx]

Uses fancy indexing to select elements from arr at indices 0, 2, and 4.

new_arr contains [1, 3, 5].

Note: This creates a new array, a copy, not a view.

5. Modifying an element of new_arr

new_arr[1] = 99

Sets the element at index 1 of new_arr (which is currently 3) to 99.

Now, new_arr becomes [1, 99, 5].

Since new_arr is a copy, this does not modify the original arr.

6. Calculating and printing the sum of arr and new_arr

print(np.sum(arr) + np.sum(new_arr))

Calculates the sum of the original array arr: 1 + 2 + 3 + 4 + 5 = 15

Calculates the sum of the modified new_arr: 1 + 99 + 5 = 105

Adds the sums: 15 + 105 = 120

Prints 120.

Final output:

120

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