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Tue Mar 23 19:55:36 CET 2010 · http://mail.python.org/pipermail/python-dev/2010-March/098764.html

On Tue, Mar 23, 2010 at 6:07 PM, Adam Olsen <rhamph at gmail.com> wrote:
> On Tue, Mar 23, 2010 at 12:04, Mark Dickinson <dickinsm at gmail.com> wrote:
>> Note that containment tests check identity before equality, so there's
>> no problem with putting (float) nans in sets or dicts:
>>
>>>>> x = float('nan')
>>>>> s = {x}
>>>>> x in s
>> True
>
> Ergh, I thought that got changed.  Nevermind then.

Hmm.  I think you're right:  it did get changed at some point early in
py3k's history;  I seem to recall that the identity-checking behaviour
got restored before 3.1 was released, though.  There was an issue
about this somewhere, but I'm failing to find it.

Mark

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[Python-Dev] Mixing float and Decimal -- thread reboot