On Fri, Jan 23, 2009 at 6:04 AM, spir <denis.s...@free.fr> wrote: > Thank you Alan and sorry for not having been clear enough. The point actually > was class (definition) attributes. I thought at e.g. Guido's views that lists > were for homogeneous sequences as opposed to tuples rather like records. And > a way to ensure sich a homogeneity, in the sense of items beeing of the same > type or super type. > The straightforward path to ensure that, as I see it, is to add proper > argument to a class definition.
A simple way to do this is with a class factory function, for example: def makeMonoList(typ, number): class MonoListSubtype(MonoList): item_type = type item_number = number return MonoListSubtype then e.g. IntegerList = makeMonoList(int, 5) myIntegerList = IntegerList() This is similar in spirit to collections.namedtuple() in Python 2.6 though the implementation is different; namedtuple() actually creates and evaluates the text of the new class definition: http://docs.python.org/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields http://svn.python.org/view/python/trunk/Lib/collections.py?rev=68853&view=auto Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor