On Apr 25, 10:01 am, Paul Rubin <http://phr...@nospam.invalid> wrote: > Mark Tarver <dr.mtar...@ukonline.co.uk> writes: > > "Assuming the following Python encodings, and ignoring questions > > of performance, would Python and Lisp lists then be observationally > > indistinguishable? i.e. would these then be fair encodings?" > > is a 'yes'. Any disagreement? > > I don't think it is equivalent: > > Python 2.4.4 (#1, Oct 23 2006, 13:58:00) > [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2 > Type "help", "copyright", "credits" or "license" for more information. > >>> a = [1,2,3] > >>> b = [4,5,6] > >>> a[1:] = b # the idea is to simulate (setf (cdr a) b) > >>> print a > [1, 4, 5, 6] > >>> b[0] = 9 # (setf (car b) 9) > >>> print a > [1, 4, 5, 6] # would expect [1,9,5,6]
I think he meant to restrict the equivalence to immutable conses. -- http://mail.python.org/mailman/listinfo/python-list
