Enabling Indexing (getitem, setitem)

Medium Magic Methods & Operator Overloading PRO

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Problem Statement

Create a `CustomList` class that wraps a standard list. Overload `__getitem__` to read an element by index, and `__setitem__` to update an element by index. Read a list of integers, update a specific index with a new value, and print the updated list directly.

Input Format

Line 1: space-separated integers (the list). Line 2: target index. Line 3: new value.

Output Format

Print the retrieved value before updating, then print the entire raw list.

Constraints

Assume the index is always valid.

Sample Input

10 20 30
1
99

Sample Output

Old: 20
List: [10, 99, 30]

Explanation

These magic methods allow custom objects to support standard bracket indexing notation `obj[index]`.

Starter Code

class CustomList:
    # Define __init__, __getitem__, and __setitem__
    pass

if __name__ == '__main__':
    lst = list(map(int, input().split()))
    idx = int(input())
    new_val = int(input())
    # Manipulate CustomList using brackets and print
    pass

Limits

Time Limit: 1s
Memory Limit: 256MB

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