On Mon, 03 Nov 2014 15:05:31 +0000, Brett Cannon <br...@python.org> wrote: > On Mon Nov 03 2014 at 5:31:21 AM Ethan Furman <et...@stoneleaf.us> wrote: > > > Just to be clear, this is about NotImplemented, not NotImplementedError. > > > > tl;dr When a binary operation fails, should an exception be raised or > > NotImplemented returned? > > > > The docs for NotImplemented suggest it's only for rich comparison methods > and not all binary operators: > https://docs.python.org/3/library/constants.html#NotImplemented . But then > had I not read that I would have said all binary operator methods should > return NotImplemented when the types are incompatible.
Ethan opened an issue and then changed those docs, but I now believe that the docs should be changed back (see the discussion in issue 22766). --David _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
