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Python

Posted by ryanosten
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ryanosten
PHP Development Techdegree Student 29,615 Points

Last challenge item not passing - reverse_evens

For the reverse_evens, I feel my code should return correct value and I tested in REPL. Here is function..

def reverse_evens(list): return list[-1::-2]

What am I missing?

2 Answers

Steven Parker
Steven Parker
225,742 Points
Steven Parker
Steven Parker
225,742 Points

Whether your slice will create reverse evens or reverse odds will be a matter of how many items are in the list. To consistently return reverse evens, you'll probably need to do one of these two things:

  • compute the starting position based on the list size
  • extract the even indexed items first, and then reverse them
ryanosten
seal-mask
.a{fill-rule:evenodd;}techdegree
ryanosten
PHP Development Techdegree Student 29,615 Points
ryanosten
.a{fill-rule:evenodd;}techdegree
ryanosten
PHP Development Techdegree Student 29,615 Points

I see. Thanks.

ryanosten
.a{fill-rule:evenodd;}techdegree
ryanosten
PHP Development Techdegree Student 29,615 Points

extracted evens and then reversed. easy peasy. Thanks for the help!

Steven Parker
Steven Parker
225,742 Points
Steven Parker
Steven Parker
225,742 Points

ryanosten — Glad to help. You can mark a question solved by choosing a "best answer".
And happy coding!