Bruno Desthuilliers wrote: > Have you considered using tuples ? If you go the FP way, why not use an > immutable type ?
Well, good question. Tuples are immutable, which means they are immutable. So you cannot use a cursor to change an element inside the list. So instead of changing the original items, you just replace the cursor with a new reference. But it it is read only, sure, use tuples. > But how are Lisp lists implemented then ?-) They are defunct binary trees, some think they are not really lists at all :-) Actually, nesting tuples or lists doesn't really duplicate Lisp cons, as one can only create a stack-like object with the nesting. Python really need a cons type like Lisp. I think it is time to write one, in a plain C extension. -- http://mail.python.org/mailman/listinfo/python-list
