On Oct 4, 3:26 pm, sd44 <sd44s...@yeah.net> wrote: > In <learning python> > part III > how does Python handle it if you try to extract a sequence in reverse, > with the lower bound greater than the higher bound (e.g., L[3:1])? Hint: > try > assigning to this slice (L[3:1]=['?']), and see where the value is put. > > >>> L=[1,2,3,4] > >>> L[3:1] > [] > >>> print L > [1, 2, 3, 4] > >>> L[3:1]=['?'] > >>> print L > > [1, 2, 3, '?', 4]
L1[a:b] = L2 removes all elements in L1 between a and b and inserts L2 at the start index. If 0 <= a < b then that removes no elements and inserts the new ones. Seems like the most sensible and consistent behaviour to me. Chard. -- http://mail.python.org/mailman/listinfo/python-list
