string[i:j:k]

[konstantin]

On Jul 22, 9:18 am, alex23 <wuwe... at gmail.com> wrote:
> On Jul 22, 3:10 pm, konstantin <konstantin.seliva... at gmail.com> wrote:
>
> > some_string[i:j:k]
> > What does it mean?
>
> i = start position, j = end position, k = step size
>
> >>> s = "ABABABABABABAB"
> >>> s[0:6:2]
> 'AAA'
> >>> s = "ABCABCABCABCABC"
> >>> s[0:6:3]
>
> 'AA'
>
> Hope this helps.
>
> - alex23

Thanks!
It seems that negative step leads in reverse direction.
But logic isn't completely clear for me.
>>> s = '123456789'
>>> s[::-2]
'97531'

but
>>> s[:-1:-2]
''
though I expected something like '8642'
What did i missed?