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Python Python Collections (2016, retired 2019) Slices Slice Functions

Posted by Marco Koopman
Marco Koopman
5,290 Points

I get the result the question wants from me but it still says it didn't get the right results

My code:

def first_4(list):

return list[:4]

def first_and_last_4(list):

new_list = list[:4] + list[-4:]

return new_list

def odds(list):

return list[1::2]

def reverse_evens(list):

reversed_list = list[::-1]
new = reversed_list[::2]

return new

The reverse_evens function returns [5,3,1] like it should. However I can't pass this question because it says that the results are wrong..

slices.py 
def first_4(list):

    return list[:4]


def first_and_last_4(list):

    new_list = list[:4] + list[-4:]

    return new_list


def odds(list):

    return list[1::2]


def reverse_evens(list):

    reversed_list = list[::-1]
    new = reversed_list[::2]

    return new

3 Answers

Alexander Davison
Alexander Davison
65,454 Points
Alexander Davison
Alexander Davison
65,454 Points

Try first getting the evens then reversing those, instead of vice versa.

def reverse_evens(list):
    evens = list[::2]
    return evens[::-1]
Marco Koopman
Marco Koopman
5,290 Points

Then it says: Bummer: Couldn't find reverse_evens.

Is this question glitched or is my code wrong?

Ross Coe
Ross Coe
5,061 Points
Ross Coe
Ross Coe
5,061 Points

@Macro - maybe an indentation error make sure you have a carriage return (cursor) over near the (left hand side numbers) gutter otherwise it may not think the function def reverse_evens is complete

Marco Koopman
Marco Koopman
5,290 Points

Nope, the indentations are all correct. I really don't know what the problem is here.

Ross Coe
Ross Coe
5,061 Points
Ross Coe
Ross Coe
5,061 Points

I mean just at the end of the def function make sure you're back over and do an extra - that worked on something else where I knew the code was right - else reach out to support if stumped - best of luck