Roy Smith wrote: > Your > choice of containers is not based on any theoretical arguments of what each > type was intended to represent, but the cold hard reality of what > operations they support.
Right. What seems missing is a "frozen list" type - the list needs to be frozen in order to be used as a dictionary key (or any other lookup structure). Fortunately, as you say, tuples already fill that role, so one could write frozenlist = tuple ... sequence = frozenlist(items) d[sequence] = d.get(sequence,0)+1 to make it explicit that here, the tuple has a different role. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
