Re: a simple question about the third index in slice

someone wrote: > I cannot quite understand when the third index is a negative > number,like this: > a = '0123456789' > a[1:10:2] I know the index step is 2, so it will collect items from > offset 1, 3, 5, 7, 9 > but when a negative number come,like: > a[1::-1] answer '10', and a[1:10:-1] only answ

a simple question about the third index in slice

I cannot quite understand when the third index is a negative number,like this: a = '0123456789' a[1:10:2] I know the index step is 2, so it will collect items from offset 1, 3, 5, 7, 9 but when a negative number come,like: a[1::-1] answer '10', and a[1:10:-1] only answer '', what is the different b