I cannot quite understand when the third index is a negative number,like this: a = '0123456789' a[1:10:2] I know the index step is 2, so it will collect items from offset 1, 3, 5, 7, 9 but when a negative number come,like: a[1::-1] answer '10', and a[1:10:-1] only answer '', what is the different between the two expression, where does the offset
begin and what is the end offset? Thanks! -- http://mail.python.org/mailman/listinfo/python-list
