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

Where is my mistake?

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]

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]

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points

Your reverse works on list with odd number of items but not an even number of items.

Can you solve for both even and odd length lists?

Hint: you can take a slice of a slice. Try getting the even indexes in order then use slice notation again to reverse the list.

Post back if you need more help. Good luck!