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Mike McCarron
1,349 PointsBug in final step, or am I crazy?
For the final step of the slices.py challenge:
"Return every item in the iterable with an even index...in reverse. For example, with [1, 2, 3, 4, 5] as the input, the function would return [5, 3, 1]."...
I'm getting the response that the test is returning the improper output. Meanwhile, I've tested this in workspaces on a list = [1, 2, 3, 4, 5], and gotten the correct output of a list containing [5, 3, 1]. So not sure what's going on here...
def first_4(random_iterable):
return random_iterable[:4]
def first_and_last_4(random_iterable2):
first_4 = random_iterable2[:4]
last_4 = random_iterable2[-4:]
return first_4 + last_4
def odds(random_iterable3):
return random_iterable3[1::2]
def reverse_evens(random_iterable4):
return random_iterable4[::-2]
2 Answers
Stuart Wright
41,120 PointsYour function works correctly if the input has an odd number of elements, but fails if the input has an even number of elements. If you pass it say [1, 2, 3, 4, 5, 6], it returns [6, 4, 2]. Those elements are at odd rather than even index in the list you passed in.
To complete this challenge takes two steps. First you need to extract those elements which are at an even index, then reverse only those elements.
Mike McCarron
1,349 PointsAha! So I am crazy. Thanks Stuart, that's extremely helpful.