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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 15 Apr 2013 22:46:49 -0600
Subject: Re: The type/object distinction and possible synthesis of OOP and imperative programming languages
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On Mon, Apr 15, 2013 at 9:17 PM, Terry Jan Reedy <tjreedy@udel.edu> wrote:
> I will keep the above in mind if I write or review a patch. here are 4
> non-subclassable builtin classes. Two are already documented. Bool in one,
> forget which other. I believe it was recently decided to leave the other two
> as is given the absence of any practical use case.

The four are bool, NoneType, slice and ellipsis, I believe.