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Task 4 of the Code Challenge is... picky?
For the last task, 4 of 4, the auto-grader won't accept this solution:
def reverse_evens(iter_item): return iter_item[-1::-2]
However, running this locally works:
>>> a = list(range(1,6)) >>> a [1, 2, 3, 4, 5] >>> a[-1::-2] [5, 3, 1]
Any of you ran into this as well? Thanks!
Your code sort of works, but it only works for lists that have an odd length.
If the length of the list is even, you should do
iter_item[0::-2]. However, as I said, that snippet only works for lists length even.
So, you would probably have to use an
if/else statement to test if the length of the list is even or odd
Here's a hint:
To test if a number is even, you can do this:
Pretend I'm in the Shell
>>> a = 10 >>> a % 2 == 0 # This tests "is a even?", and it is so Python returns True True >>> b = a - 1 # In this case, b will be 9 (which is a - 1) >>> b % 2 == 0 False
If you have questions on the
% operator, respond below with the text
#modoperator inside and I'll explain. :)
I hope this helps