According to https://docs.python.org/3/glossary.html#term-iterator and https://docs.python.org/3/library/stdtypes.html#typeiter, iterators must implement the __iter__ method.
On Sun, 2021-11-28 at 22:02 -0500, David Mertz, Ph.D. wrote: > On Sun, Nov 28, 2021, 8:59 PM Steven D'Aprano > > To be an iterator, your object needs: > > > > 1. a `__next__` method which returns the next value; > > 2. and an `__iter__` method which returns self. > > That's not quite right. > > An iterator only needs .__next__(), and an iterable only needs > .__iter__(). Returning self is a convenient, and probably the most > common, way of creating an object that is both. But exceptions exist, > and remain iterators and/or iterables. > > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/FWRNYVLPJV7SZD5E2M5LP2GYECKBONPG/ > Code of Conduct: http://python.org/psf/codeofconduct/
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