On Tue, Aug 20, 2013 at 3:31 PM, Walter Prins <wpr...@gmail.com> wrote:
> On 20 August 2013 10:20, sikonai sikonai <tanjyu...@gmail.com> wrote:
>>
>> >>> list=[1,2,3,4,5,6,7,8,9]
>> >>> list[9:0:-2]
>> [9, 7, 5, 3]
>> >>> list[10:0:-2]
>> [9, 7, 5, 3]
>
> For the specific list you show, the 2 expressions yield the same result.
> However this does not mean that this is true of any list. The reason the 2
> expressions return the same result is because the starting index for the
> slice operation is effectively capped at 9, due to the list containing only
> 9 elements, so hence any value above 9 in the first slice parameter is
> essentially reset/capped to 9.
The start index is capped at 8:
>>> slice(9, 0, -2).indices(9)
(8, 0, -2)
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