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

Posted by Michael Gallego
Michael Gallego
1,568 Points

Not sure why this is wrong. I made the function that returns first 4 and last 4 from the iterable argument from function

I tested it out in the python shell and it worked perfectly. Not sure why it isn't working here. It's not like i'm assigning a variable. I am just returning first four and last four like it said.

slices.py 
def first_4(whatever):
    return whatever[0:4]

def first_and_last_4(imagine):
    return imagine[0:4] + imagine[-1:-5:-1]

1 Answer

Chris Howell
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Chris Howell
Python Web Development Techdegree Graduate 49,702 Points
Chris Howell
.a{fill-rule:evenodd;}techdegree seal-36
Chris Howell
Python Web Development Techdegree Graduate 49,702 Points

Hey Michael Gallego

So the challenge asks you to give you the first 4 and the last 4.

Your code is giving the first 4 and then giving the last 4, but the last 4 is in reverse order. It didn't ask for the last 4 to be in reverse.

Hope that helps! :)

Chris Howell
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.a{fill-rule:evenodd;}techdegree seal-36
Chris Howell
Python Web Development Techdegree Graduate 49,702 Points
Chris Howell
.a{fill-rule:evenodd;}techdegree seal-36
Chris Howell
Python Web Development Techdegree Graduate 49,702 Points

Example: If I passed in

test_data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

first_and_last_4(test_data)

I should expect to get back from first_and_last_4 function.

`>>> [1, 2, 3, 4, 7, 8, 9, 10]`