Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Bruce Röttgers
18,211 Pointsreverse_evens returns wrong values
Hey, I wrote the code found attached. In the challenge reverse_evens seems to be returning the wrong values but in my local editor it returns the correct answer.
def first_4(l):
return l[:4]
def first_and_last_4(l):
return first_4(l) + l[-4:]
def odds(l):
return l[1::2]
def reverse_evens(l):
return l[::-2]
1 Answer
Steven Parker
231,269 PointsYou're half right. Your method will work when the list has an odd number of items. But when the list has an even number of items, it will return reverse odds instead.
To always return reverse evens, there's two basic strategies:
- compute the starting position based on the list size
- extract the even index values first, then reverse them
Either one will pass the challenge when implemented correctly.