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Date: Fri, 6 Mar 2015 10:40:19 +1100
Subject: Re: Is nan in (nan,) correct?
From: Chris Angelico <rosuav@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
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Xref: csiph.com comp.lang.python:86968

On Fri, Mar 6, 2015 at 10:27 AM,  <sohcahtoa82@gmail.com> wrote:
> Do you have an example of where `a is b` but `a != b` in Python?  `None == None` is True.

Check out the subject line.

>>> nan = float("nan")
>>> nan is nan  # obviously
True
>>> nan != nan  # IEEE 754 mandates
True

ChrisA