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Date: Thu, 05 Mar 2015 19:18:08 -0800
From: Ethan Furman <ethan@stoneleaf.us>
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To: python-list@python.org
Subject: Re: Is nan in (nan,) correct?
References: <mailman.67.1425594415.21433.python-list@python.org> <54f90c53$0$12994$c3e8da3$5496439d@news.astraweb.com> <858ufazvff.fsf@benfinney.id.au>
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On 03/05/2015 06:55 PM, Ben Finney wrote:

>     class NullType(object):
>         """ A type whose value never equals any other.
>=20
>             This type's values will behave correctly when tested for
>             membership in a collection::
>=20
>                 >>> foo =3D NullType()
>                 >>> bar =3D NullType()
>                 >>> foo is foo
>                 True
>                 >>> foo is bar
>                 False
>                 >>> foo =3D=3D foo
>                 False
>                 >>> foo =3D=3D bar
>                 False
>                 >>> quux =3D [foo, "spam"]
>                 >>> "spam" in quux
>                 True
>                 >>> foo in quux
>                 True

Did you mean False here?  Because True is current behavior.

--
~Ethan~


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