"André" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED]
>Terry Reedy wrote: >> It appears that s[i:j:-1] is s[(j+1):(i+1)] .reverse()'ed. For >> 'numbers', >> this is 10, 9, 8, 7, 6, 5, 4, 3, 2]. Then take every other item. Why >> the >> +1? Don't know and not my intuitive expectation. I just know that >> extended slicing was developed for and until recently pretty much <> restricted to numeric (now numpy). > It's not simply "+1". Yes it is. Boundary adjustment follows, as implied by what I wrote. > >>> a = range(10) > >>> a[9:0:-2] > >>> a[10:0:-2] > >>> a[11:0:-2] > >>> a[42:0:-2] are all [9, 7, 5, 3, 1] because a[1:10] == a[1:11] == a[1:12] == a[1:43] == [1,3,5,7,9], which is then reversed. Terry Jan Reedy
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