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

reverse evens list ... i am not getting it right ... however when i do locally on python idle .. i find that i get it ri

please fid where i am getting it wrong

def first_4(items):
    return items[0:4]

def first_and_last_4(items):
    return items[0:4] + items[-4:]

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

def reverse_evens(items):
    ri = items[2::2]
    return ri[::-1]


first4 = first_4(items)
last4 = first_and_last_4(items)
oddn = odds(items)
rit = reverse_evens(items)


1 Answer

You got it! Just a minor typo or oversight in the reverse_evens function. The slice index should start at 0 (i.e., items[ : : 2]) instead of 2.

thanks mark