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 Jirka Michalik
Jirka Michalik
11,573 Points

Great work! OK, this second one should be pretty similar to the first. Make a new

Can you help me please? My code is working in PyCharm, but it is not working in python shell :/

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

def first_and_last_4(iterable):
    first = iterable[:4] 
    last = iterable[:-5:-1]
    return first + last

2 Answers

eck
eck
43,038 Points
eck
eck
43,038 Points

I think your problem is that the way to are slicing the list to get the value for last returns 8, 7, 6, 5 and it is the incorrect order.

Another way to can slice the last 4 values and maintain the correct order would be: last = iterable[-4:]. This starts slicing at the 4th value from the end and since there is no value on the right side of the colon it will slice everything from that 4th last position to the end of the list.

Jirka Michalik
Jirka Michalik
11,573 Points
Jirka Michalik
Jirka Michalik
11,573 Points

Yeah I got that ... It must be [-4:], but thank you for quick response :)