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Wellington Souza
3,121 PointsWhat is wrong with my code?
I have run this in my python shell and it works. def first_4(itb): return itb[:4]
def odds(itb): return itb[1::2]
def first_and_last_4(itb): return itb[:4] + itb[-4:]
def reverse_evens(itb): return itb[::-2]
r = reverse_evens([1, 2, 3, 4, 5]) print(r)
def first_4(itb):
return itb[:4]
def odds(itb):
return itb[1::2]
def first_and_last_4(itb):
return itb[:4] + itb[-4:]
def reverse_evens(itb):
return itb[::-2]
r = reverse_evens([1, 2, 3, 4, 5])
print(r)
1 Answer
Elad Ohana
24,456 PointsHi Martin,
That only works when you have an odd number of items. For example, on the list [1, 2, 3, 4, 5] it does return [5, 3, 1], which are indexes 4, 2, 0. But, if you have the list [1, 2, 3, 4, 5, 6], it will return [6, 4, 2], which are indexes 5, 3, 1, which means it should return [5, 3, 1] instead. My solution was to first slice the even numbers, and then reverse it.
Hope this helps.