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

victor E
victor E
19,146 Points
Posted by victor E
victor E
19,146 Points

I could swear I am doing this correctly but it is giving me a hard time...

this is what I am using for these challenges... what am I missing? also, on the next one it asks to return the value for an iterable showing only odd numbers so I typed:

def odd(iterable): return iterable[1::2]

this way it can begin with 1, leave the zero out and skip every number to return only odd numbers.

what am I missing?

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

def first_and_last_4(iterable):
    return iterable[:4][-4:]

2 Answers

Demetrius lewis
Demetrius lewis
10,424 Points
Demetrius lewis
Demetrius lewis
10,424 Points

Hey Victor,

I'm assuming it wants you to return the first and last 4 of iterable as a single list of numbers or items. The way i would do it is return iterable[:4] + iterable[-4:]. This will return one list with first four items of iterable and last four items.

victor E
victor E
19,146 Points
victor E
victor E
19,146 Points

Thank you very much!

Viraj Deshaval
Viraj Deshaval
4,874 Points
Viraj Deshaval
Viraj Deshaval
4,874 Points

Yes whatever you did for odd numbers was correct. The only thing you were missing is concatenation for finding first 4 and last 4 numbers. Your logic was absolutely correct. Best Practice is to add the brackets '()'. So, return (iterable[:4] + iterable[-4:]) Remember slices work like slices[start:stop:step]