Steven D'Aprano wrote: > John Salerno wrote: > > > Given: > > > > numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] > > > > can someone explain to me why > > > > numbers[10:0:-2] results in [10, 8, 6, 4, 2]? > > I think the documentation is misleading/incomplete when > it comes to negative strides for extended slices.
Agreed! [snip...] > > The indices actually selected are: > > 9, 7, 5, 3, 1 > > at which point I give up and throw my hands in the air > and promise never to use negative strides with extended > slices. > !!! Agreed! I found this which seems an appropriate description: """ An extended slice of list x of length n in the form x[j:k:i] selects every i-th element starting with and including the element at index j and ending with but not including the element at index k. When either index is negative, the value of n is added to it before any further processing occurs. When either index is missing or lies outside of the list bounds, the minimum or maximum inclusive index is used automatically. """ source: https://trove.homeip.net/ExtendedSlices André > -- > Steven. -- http://mail.python.org/mailman/listinfo/python-list
