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frozenaught
4,849 PointsI don't understand why this code is incorrect?
Hello, could someone please help me understand you this is this code is incorrect? It works fine when i test it but for some reason when i use it to answer the quiz i get "Didn't get the expected answer"
def reverse_evens(item): return item[::-2]
def first_4(item):
return item[:4]
def first_and_last_4(item):
return (item[:4]) + (item[-4:])
def odds(item):
return item[1::2]
def reverse_evens(item):
return item[::-2]
f4u57
6,743 Points@Dave StSomeWhere , Good point!!!
frozenaught
4,849 PointsOh thank you @Dave StSomeWhere , somehow I don't think I fully thought this one through. All is working now. I appreciate the help.
1 Answer
f4u57
6,743 PointsThis is another way, but the better way to do it is you want to pick out all the even index items then reverse the order. I am not a pro, but I will try my best.
def reverse_evens(item):
return item[::2][::-1]
# A break down version
def reverse_evens(item):
# Picking out all the even index item assign it to even
even = item[::2]
# Takes all the even index item then reverse the order and assign it to reverse_order
reverse_order = even[::-1]
return reverse_order
Dave StSomeWhere
19,870 PointsDave StSomeWhere
19,870 PointsYou code is incorrect because you only return the values with even indexes when there is an odd number of values.
Their example of
[1, 2, 3, 4, 5]works just fine and you get[5, 3, 1]the desired resultBut, if the list is
[1, 2, 3, 4, 5, 6]you code produces[6, 4, 2]giving the odd index values.So, you need to determine if there are an even or odd number of values in the list and adjust appropriately.