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Pratham Patel
4,976 PointsCan I get some help with this code challenge
I don't understand the negative index
def first_4(list):
return list[0:4]
def first_and_last_4(list):
return list[0:4] list[-4:-1]
3 Answers
Kenneth Love
Treehouse Guest TeacherYou've figure it out except for one litle thing. Slices don't include the end of the slice. Since you're slicing to -1, you'll never get the last item. What happens when you leave the stop argument off of a slice?
Pratham Patel
4,976 PointsIt would start at 3 and go to the end of the list
Kenneth Love
Treehouse Guest TeacherOK, and this challenge wants you to start at -4 and go to the end of the list...
Pratham Patel
4,976 PointsI took out the one and wrote [-4:] but it says try again
Kenneth Love
Treehouse Guest TeacherYou need to combine the two slices.
Pratham Patel
4,976 PointsI'm not sure how to do that I searched it but they say you need to use a function
Kenneth Love
Treehouse Guest TeacherNope, just add 'em together.
Pratham Patel
4,976 PointsPratham Patel
4,976 PointsI switched around the -4 and -1 but it still did not work
Kenneth Love
Treehouse Guest TeacherKenneth Love
Treehouse Guest TeacherYeah, it wouldn't. You can't move from
-1to-4by adding 1.So, answer my question. What does a slice do when you leave off the second part? If you did
list[3:], what would you get?