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 Md Akibe Hashan
Md Akibe Hashan
2,422 Points

Make a new function named first_and_last_4. It'll accept a single iterable but, this time, it'll return the first four a

why this still showing not "didn't get the right value for first_and_last_4" I will be happy if anyone show my mistake

slices.py 
def first_4(iterable):
    return iterable[:4]
def first_and_last_4(iterable):
    first=iterable[1:]
    last=iterable[-1:]
    result=first+last
    return result

1 Answer

Mohit Yadav
Mohit Yadav
8,292 Points
Mohit Yadav
Mohit Yadav
8,292 Points

You did the first_4 function correctly and needed to put that as it is in the first_and_last_4

def first_4(iterable):
    return iterable[:4]
def first_and_last_4(iterable):
    first=iterable[:4]
    last=iterable[-4:]
    result=first+last
    return result

In the first_and_last_4 function, for the first 4 part you need to set STOP as index 4 so it will loop from beginning as default and end at index 4 and for the last 4 you need to set START as -4 so it will go one step from -4 ahead each time and end at the last value with default step of 1