"Steven Bethard" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Probably you want to catch a TypeError instead of an AttributeError; > objects may support the iterator protocol without defining an __iter__ > method:
No, having an __iter__ method that returns an iterator is an essential half of the current iterator protocol just so that iter(iterator) (== iterator.__iter__()) always works. This requirement conveniently makes 'iterator' a subcategory of 'iterable'. (I am ignoing the old and obsolete getnext protocol, as does the itertools library module.) Terry J. Reedy -- http://mail.python.org/mailman/listinfo/python-list
