Python Coding Challange - Question with Answer (01250725)

 

Explanation:

✅ Step-by-step:

1. arr = [1, 2, 3]
   → Creates a list named arr.

2. arr2 = arr
   → This does not copy the list.
   → It means arr2 refers to the same list object in memory as arr.

3. arr2[0] = 100
   → Changes the first element of the list to 100.
   → Since both arr and arr2 point to the same list, this change is reflected in both.

4. print(arr)
   → Outputs the modified list.

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✅ Output:

[100, 2, 3]

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 Summary:

In Python, assigning one list to another variable (e.g., arr2 = arr) creates a reference, not a copy.

To make a copy, you'd need:

arr2 = arr.copy()  # or arr2 = arr[:]

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