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Python Python Collections (2016, retired 2019) Slices Slice Functions

Having problems with First Slice Challenge. Cannot go past the third step.

Can't understand what I'm doing wrong.

def first_4(iterable):
    return iterable[0:4]
def first_and_last_4(iterable):
    return iterable[:4] + iterable[-4:-1]
def odds(iterable):
    return iterable[1::]

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 67,990 Points

First, you seem to have introduced an error in the Task 2 code. The last slice should be [-4:]. The last -1 reversed the order of the last four items.

For Task 3, you are providing the items at index 1,... etc. However, the challenge wants every other item. How can you add a skip to the slice to get every other one?

Post back if you need more help! Good luck!!

Hi Chris, apologies for the late reply but I was able to figure it out. Thanks for your help!