Python Coding Challenge - Question with Answer (01291025)

 

Explanation:

Import the NumPy Library

import numpy as np

This line imports the NumPy library and gives it a short alias name np.

NumPy provides functions for creating and manipulating arrays efficiently.

Create a NumPy Array

a = np.arange(1,10).reshape(3,3)

np.arange(1,10) → creates a 1D array from 1 to 9 (end is exclusive of 10).

Result: [1, 2, 3, 4, 5, 6, 7, 8, 9]

.reshape(3,3) → converts it into a 3x3 matrix (2D array).

So now:

a =

[[1 2 3]

 [4 5 6]

 [7 8 9]]

Initialize a Variable

total = 0

total will store the running sum of some elements from the array.

Starts at 0.

Loop Through Each Row

for i in range(3):

range(3) → generates numbers 0, 1, 2

These are the row indices of the array a.

So the loop runs 3 times:

1st iteration → i = 0

2nd iteration → i = 1

3rd iteration → i = 2

Access and Add Last Column Element

total += a[i, 2]

a[i, 2] means:

Row = i

Column = 2 (the third column, since index starts at 0)

Now let’s see each iteration:

i a[i,2] total (after addition)

0 3 0 + 3 = 3

1 6 3 + 6 = 9

2 9 9 + 9 = 18

Print the Result

print(total)

Output:

18

APPLICATION OF PYTHON IN FINANCE