On 7/20/06, Greg Ewing <[EMAIL PROTECTED]> wrote: > Walter Dörwald wrote: > > > I don't know about __call__, but str and unicode don't have __iter__, > > list, tuple and dict do: > > That's probably because str and unicode don't do their > own iteration, but rely on the fallback implementation. > In which case it's perfectly correct for them not to > have an __iter__ method. > > If you want to test whether something is iterable, it's > not enough to test for __iter__ -- you also need to > test for __len__ and __getitem__ as an alternative. > Which means it might make sense to have an iterable() > function which does that.
And that's a problem, because if uses those to implement a mapping, it isn't reasonably iterable with just those. -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
