How the index in list works when index is -1

Question

list1 = [1,2,3,4,5]
list2 = list1.insert(-1, 100)
list2 = [1,2,3,4,100,5]

I can't understand why the result becomes like above...

Possible duplicate of [Negative list index?](https://stackoverflow.com/questions/11367902/negative-list-index) — user202729, Mar 21 '18 at 11:36
Can You try with different negative values? -2, -3, -4, -5 ? Check the result and You will get the answer. Good luck. — zolv, Mar 21 '18 at 11:36
@zolv Trial-and-error is not the best way to learn programming. Read the documentation is better. — user202729, Mar 21 '18 at 11:52

score 2 · Answer 1 · answered Mar 21 '18 at 11:36

2

the minus index counts from the right. So you're insert is inserting before the last item on the list. To add an item to the end of the list use:

list1.append(100)

answered Mar 21 '18 at 11:36

Gareth O'Connor

1 Answers1