Python Coding challenge - Day 503| What is the output of the following Python Code?

 

Code Explanation:

1. Create NumPy Array

a = np.array([1, 2, 3])

Creates a NumPy array a with values [1, 2, 3].

Shape: (3,), dtype: int64

a now → [1, 2, 3]

2. Assign Reference (Not a Copy)

b = a

b is not a new array — it references the same memory as a.

So, any change in b will reflect in a and vice versa.

3. Modify Element via Reference

b[0] = 99

Changes the first element of b to 99.

Since a and b are the same object, a also becomes [99, 2, 3].

4. Create a Deep Copy

c = a.copy()

Creates an independent copy of a.

Now c = [99, 2, 3], but it does not share memory with a or b.

5. Modify the Copy

c[1] = 88

Changes the second element of c to 88.

c becomes [99, 88, 3].

a and b remain [99, 2, 3].

6. Sum All Arrays and Print Result

print(np.sum(a) + np.sum(b) + np.sum(c))

a = [99, 2, 3] → sum = 104

b = [99, 2, 3] → same as a → sum = 104

c = [99, 88, 3] → sum = 190

Total Sum: 104 + 104 + 190 = 398

Final Output: 398