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

Magda Roslaniec
Magda Roslaniec
1,166 Points
Posted by Magda Roslaniec
Magda Roslaniec
1,166 Points

Can't understand why my code is not accepted. Task 2

This is my code: def first_4(item):

return item[0:4]

def first_and_last_4(item): first = first_4(item) second = item[-1:-4:-1] first_and_last_4 = first + second

return first_and_last_4

Maybe I don't understand what to do, but I thought that I had to concatenate two strings to return a single value? If not, what should I do to correct the code?

slices.py 
def first_4(item):

    return item[0:4]

def first_and_last_4(item):
    first = first_4(item)
    second = item[-1:-4:-1]
    first_and_last_4 = first + second

    return first_and_last_4

2 Answers

Grace Kelly
Grace Kelly
33,990 Points
Grace Kelly
Grace Kelly
33,990 Points

You're almost there except for your slice method. In order to slice the last four items we can do the following:

item[-4:]

By doing this you are saying you want to start from the end of the item and slice backwards 4 steps :)

Hope that helps!!

Magda Roslaniec
Magda Roslaniec
1,166 Points
Magda Roslaniec
Magda Roslaniec
1,166 Points

OK, I found my mistake. There should be second = item[-4:].