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

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

Posted by Jayden Hassan
Jayden Hassan
3,099 Points

Why am I not passing

I have no idea why task 4 isn;t passing

If anyone has a task four on this, please let me know

slices.py 
def first_4(iterable):
    return iterable[:4]

def odds(iterable):
    return iterable[1::2]

def first_and_last_4(iterable):
    return iterable[:4] + iterable[-4:]

def reverse_evens(iterable):
    return iterable[0::-2]
Gustavo Winter
Gustavo Winter
Courses Plus Student 27,382 Points
Gustavo Winter
Gustavo Winter
Courses Plus Student 27,382 Points

Hello Jayden, you are really close, i'll' give you a little hint and the answer, but i know you can do this just with the hint.

HINT: 

First Step: You need to select every Second number, 
Second Step: You reverse the array.
Hint: Do it in two actions [action one] [action two]

But if you are like me, who need to see some code to get 100%, here is the answer.

def reverse_evens(iterable):
    return iterable[::2][::-1]

1 Answer

Peter Smart
Peter Smart
9,150 Points
Peter Smart
Peter Smart
9,150 Points

Yeah you're super close. Test for the length of the iterable first though. Every second number in reverse is not the same as every second number from the end. A simple check with '''python if iterable %2: ''' should help establish your start position.