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

Morten Egge
Morten Egge
1,898 Points
Posted by Morten Egge
Morten Egge
1,898 Points

Error on reverse evens assignment

I keep getting an error for this assignment, I have tested the function in python and it works outside. I have no clue whats wrong.

slices.py 
def first_4(itr):

    return itr[:4]

def first_and_last_4(itr):
    combo = itr[0:4] + itr[-4:]
    return combo

def odds(itr):
    return itr[1::2]

def reverse_evens(itr):
    reverse = itr[-1::-2]
    return reverse
Igor Ević
Igor Ević
5,827 Points

Your reverse_evens function doesn't work with every itr. Try function with list [1, 2, 3, 4, 5, 6]

1 Answer

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi Morten,

If you have a look through this post, it explains what Igor pointed out.

You need to pull out the evens into a local list first, then reverse that.

Steve.