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

Task 4 at Slice Functions doesn't pass def reverse_evens(x): arr = x[::2] return arr.reverse()

Modifications like return x[-1::-2] or x[::-2] don't pass as well

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

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

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

def reverse_evens(x):
    arr = x[::2]
    return arr.reverse()

1 Answer

Joshua Tiedtke
Joshua Tiedtke
5,647 Points

I don't exactly now why .reverse() doesn't work, but instead you can just take your arr and slice it like:

bla = arr[::-1] and then return bla

the -1 walks backwards through the iterable and reverses it.