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

Posted by Sarah Burgart
Sarah Burgart
5,159 Points

how to find evens and then reverse the list - I couldn't figure out how to do a second change to the iterable

without creating a new variable - but that seems to have thrown more of a wrench into the situation - any advice / hints would be apprecaited.

thank you

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

def first_and_last_4 (iterable):
   a = iterable[:4]
   b = iterable[-4:]
   c = (a+b)
   return c

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

reverse_evens(iterable):
    #this step creates a new list to hold the even indexed items
    evens_slice[] = iterable[::2]
    #this step reverses the list and returns it
    return evens_slice[::-1]

1 Answer

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,720 Points
Jeff Muday
Jeff Muday
Treehouse Moderator 28,720 Points

You are so close! If you get rid of the square brackets on the left-hand side of the equal sign, it should work for you.

reverse_evens(iterable):
    #this step creates a new list to hold the even indexed items
    # evens_slice[] = iterable[::2]
    evens_slice = iterable[::2] # here is the change
    #this step reverses the list and returns it
    return evens_slice[::-1]
Sarah Burgart
Sarah Burgart
5,159 Points

thank you Jeff, I could've sworn that was the first thing I tried ... but it definitely worked this time!