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]