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

Posted by Adrian Brenton
Adrian Brenton
8,110 Points

Stuck with a slice challenge (the hardest part)

Hello all,

I've been trying to solve the final part of the python slices code challenge, and I've been stumped for a few days now, after trying several different things - I'm interested to see where my thinking and logic is going awry, so that I can understand how to solve this - any help and/or advice is appreciated!

Many Thanks in advance

Kind Regards

slices.py 
def first_4(iterable):
    return iterable[:4]

def first_and_last_4(iterable):
    return iterable[:4] + iterable[-4:]

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

def reverse_evens(iterable):
    return iterable[-2::-2]

1 Answer

Jason Grunill
Jason Grunill
8,603 Points
Jason Grunill
Jason Grunill
8,603 Points

Hi Adrian, your code looks correct but i think you need to accommodate for a list of all lengths. Try.....

def reverse_evens(iterable):
    if len(iterable) % 2:
        my_iterable = iterable[-1::-2]
    else:
        my_iterable = iterable[-2::-2]
    return my_iterable

Hope this helps.

Adrian Brenton
Adrian Brenton
8,110 Points

I see what I missed now... trying to condition myself to think like a programmer.... slowly but surely - many thanks for you r help!