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

Help me!!

Great work! OK, this second one should be pretty similar to the first. Make a new function named first_and_last_4. It'll accept a single iterable but, this time, it'll return the first four and last four items as a single value. Please write the code.

def first_4(a):
    return a[:4]
def first_and_last_4(b):
    return b[-1:-5:-1] + b[:4]

2 Answers

Christopher Shaw
.a{fill-rule:evenodd;}techdegree seal-36
Christopher Shaw
Python Web Development Techdegree Graduate 58,248 Points

You are returning the last 4 first, and in reverse order. Your should put the first 4 first, then the last 4.

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

Thanks a lot! ;)

Hi there!

You're really close!

At the moment you're reversing the string you get back from the last four part by starting at the last character (-1) stopping at the end -4 (-5) and stepping by minus 1. so


You want to find a way to start at the 6 (four steps from the end) and step forwards to the end :)

Hope it helps

Thank you sooo much! ;)