List insert at index that is well out of range - behaves like append

Question

I had a list

 a = [1, 2, 3]

when I did

a.insert(100, 100)

[1, 2, 3, 100]

as list was originally of siz

Answer 1

When you insert a single element into a list, the length of the list will grow by exactly one - not more, not less.