Python Coding challenge - Day 665| What is the output of the following Python Code?

Code Explanation:

1. Importing NumPy

import numpy as np

Loads the NumPy library.

Gives it the alias np so we can write np.function() instead of numpy.function().

2. Creating an Array Using arange

arr = np.arange(5) * 3

np.arange(5) creates:

[0, 1, 2, 3, 4]

Multiplying by 3 scales every element:

[0, 3, 6, 9, 12]

Now:

arr = [0, 3, 6, 9, 12]

3. Modifying Elements Greater Than 6

arr[arr > 6] = arr[arr > 6] - 2

arr > 6 creates a Boolean mask:

[False, False, False, True, True]

arr[arr > 6] selects the values [9, 12].

Subtracting 2 from them → [7, 10].

These new values replace the originals in arr.

Now:

arr = [0, 3, 6, 7, 10]

4. Calculating the Mean

print(arr.mean())

Mean = sum of elements ÷ number of elements.

Sum: 0 + 3 + 6 + 7 + 10 = 26

Count: 5

Mean = 26 / 5 = 5.2

Output:

5.2

Final Output:

5.2

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