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how to get INDEX count, or last number of Index


On 5/23/2018 8:46 PM, bartc wrote:
> On 24/05/2018 00:44, Terry Reedy wrote:
>> On 5/23/2018 5:56 PM, Rob Gaddi wrote:
>>> On 05/23/2018 02:51 PM, asa32sd23 at gmail.com wrote:
>>>> s = "kitti"
>>>>
>>>> 0,1,2,3,4
>>>> k,i,t,t,i
>>>>
>>>> how do i retrieve '4'. i know i can do a len(s)-1,
>>
>> Use -1, which is the same as len(s)-1 but faster.
> 
> This illustrates one problem with having a example sequence of values 
> being identical to the indices of those values.
> 
> I would have used 10,20,30,40,50 so there could be no such mix-up.
> 
> Because I assumed here that the OP wanted the index of the last value, 
> the '4' they said they wanted, not the last value itself which would be 
> 'i'.
> 
> And actually, the subject line seems to confirm that.
> 
> In that case, using a '-1' index won't work.

You snipped the code that shows that -1 does work to fetch the last 
character.

 >>> s = 'kitty'
 >>> s[len(s)-1]
'y'
 >>> s[-1]
'y'



-- 
Terry Jan Reedy