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
David Wright
4,437 PointsSlice functions - task 3 of 3
Not sure how to combine and return multiple slices of a list
def first_4(itb):
return itb[:4]
def odds(itb):
return itb[1::2]
def first_and_last_4(itb):
return itb[0:4 and -4:]
3 Answers
Andrew Winkler
37,739 PointsYou almost got it. Remember concatenation? Use it.
def first_and_last_4(itb):
return itb[:4] + itb[-4:]
Chris Freeman
Treehouse Moderator 68,441 PointsThere are a few way to do this. One is to add the second slice to the first:
def first_and_last_4(itb):
result = itb[0:4]
result.extend(itb[-4:])
return result
Alex Calder
1,110 PointsWhy does this not work?
return z[0:4].extend(z[-4:])
Chris Freeman
Treehouse Moderator 68,441 PointsThis does not work due to two elements.
z[0:4] is stored in a temporary variable.
extend() method operates "in place" on an object and returns None
Therefore, the compound statement value is None which is what is returned by the function return.