Test None for an object that does not implement ==

[Roy Smith]

In article <mailman.4082.1324858055.27778.python-list at python.org>,
 Devin Jeanpierre <jeanpierreda at gmail.com> wrote:

> The issue here is that "== None" is being used instead of "is None",
> but I believe that's been covered. Your response doesn't include it,
> so maybe it's worth restating.

Which of course leads to a SillyPEP for a new keyword, "are", which 
would allow you to write:

>>> a and c are None

instead of the much more verbose

>>> a is None and c is None