> > >>> s = [1,2,3] > >>> x = 5 > >>> s[len(s):len(s)] = [x] # (1)
> >>> s [1, 2, 3, 5] When you did s[len(s):len(s)] you got the slice begining at len(s) with end at len(s) - 1, ie, nothing. At step (1), len(s) = 3, so you did s[3:3] = [x]. It meant that the slice starting at index 3 (ie, just after s' end) is (now) the list [x]. When you did it again, you got slice s[4:4], which is empty. []'s Douglas
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