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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 68,423 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 68,423 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.