On 21 Feb., 02:30, Steven D'Aprano <st...@remove-this- cybersource.com.au> wrote: > Python lists are arrays of pointers to objects, so copying a slice is > fast: it doesn't have to copy the objects, just pointers. Deleting from > the end of the list is also quick, because you don't have to move memory, > just clear some pointers and change the length field. > > Splitting such an array without copying data is, essentially, impossible. > Python lists aren't linked lists.
Well, to split a C array I would simply set l2 to point to l1[10] and then change the length of l1 (which I store somewhere else). No copying of elements needed. I would have assumed that python can do something like this with its internal arrays of pointers, too. Anyway, this was more a question about coding style. I use l1.extend(l2) or l1 += l2 rather than l1 = l1 + l2 because it's as readable and possibly faster. I was simply wondering if something similar exists for splitting lists. -- http://mail.python.org/mailman/listinfo/python-list
