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Date: Sun, 25 Dec 2011 20:26:06 -0800
From: Ethan Furman <ethan@stoneleaf.us>
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Subject: Re: Test None for an object that does not implement ==
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17948

Nobody wrote:
> nothing should compare
> equal to None except for None itself, so "x is None" and "x == None"
> shouldn't produce different results unless there's a bug in the comparison
> method.
> 

Why wouldn't you want other types that can compare equal to None?  It 
could be useful for a Null type to == None.

~Ethan~