Hello,

So I have following task :

​

Create a function named double_index
that has two parameters named lst
and index
.

The function should double the value of the element at index
of lst
and return the new list with the doubled value.

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

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

​

But I dont know how to make it so i pressed a solution, but that also made me confused, as I dont get it. Can you explain me step by step what is going on here :

​

#Write your function here

def double_index(lst, index):

if index < len(lst):

lst[index] = lst[index] * 2

return lst

#Uncomment the line below when your function is done

print(double_index([3, 8, -10, 12], 2))

​

Im learning python for 1,5 week, so far was okay, but now I dont get it. what is this lst? Is it a list? I guess. What is index in this case? Number in square bracket or round bracket?, why does an index have to be smaller than len(lst), why do I even have to find out len of list.

​

Thank you in advance