Shouldn't "the last 3" be [-3:] instead of [3:] ? Inyour case it gives the correct result, but that's because your list has 6 elements i think. ( note : typing

Shouldn't "the last 3" be [-3:] instead of [3:] ? Inyour case it gives the correct result, but that's because your list has 6 elements i think. ( note : typing on my phone so i can't verify).