> There are so many varieties of iterator that it's probably not workable > to alter the iterator API for all of the them.
i always wondered if it can be implemented: there are iterators which has length: >>> i = iter([1,2,3]) >>> len(i) 3 now isn't there a way to make this length inheritible? eg. generators could have length in this case: >>> g = (x for x in [1,2,3]) >>> # len(g) == len([1,2,3]) == 3 of course in special cases length would remain undefined: >>> f = (x for x in [1,2,3] if x>2) >>> # len(f) == ? IMHO there are special cases when this is useful: L=list(it) here if it has length, then list creation can be more effective (required memory is known in advance) nsz -- http://mail.python.org/mailman/listinfo/python-list
