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


Make a function named reverse_evens that accepts a single iterable as an argument. Return every item in the iterable with an even index...in reverse. For example, with [1, 2, 3, 4, 5] as the input, the function would return [5, 3, 1].

def first_4(item):
    return item[:4]
def first_and_last_4(item):
    return item[:4] + item[-4::1]
def odds(item):
    return item[1::2]
def reverse_evens(item):
    return item[::-2]

2 Answers

Chris Freeman
Chris Freeman
Treehouse Moderator 67,989 Points

You are on the right path. By simply taking every other item from the back of the list you may get the even indexed items or odd indexed items depending on the original length of the list. Best to use two slices: first get even indices, then reverse the first slice.

BTW, slices can be chained. For example, collection[5:11][::2] returns item indexes 5, 7, 9

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

I figured out, thanks for the help!!!