Double index

explain any-one how i do start for that

Create a function named double_index that has two parameters: a list named lst and a single number named index .

The function should return a new list where all elements are the same as in lst except for the element at index . The element at index should be double the value of the element at index of the original lst .

If index is not a valid index, the function should return the original list.

For example, the following code should return [1,2,6,4] because the element at index 2 has been doubled:

double_index([1, 2, 3, 4], 2)

After writing your function, un-comment the call to the function that we’ve provided for you to test your results.

Consider how you would write this out on paper-if you were to do this task. Next, find out how you would write instructions for someone else to do it. Lastly, turn those instructions into code.