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From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: The type/object distinction and possible synthesis of OOP and imperative programming languages
Date: Mon, 15 Apr 2013 20:52:58 -0400
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Xref: csiph.com comp.lang.python:43651

On 4/15/2013 1:43 PM, Antoon Pardon wrote:

> $ python3
> Python 3.2.3 (default, Feb 20 2013, 17:02:41)
> [GCC 4.7.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> class vslice (slice):
> ...   pass
> ...
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: type 'slice' is not an acceptable base type
>
>
> It seems types and classes are still not mere synonyms.

Some builtin classes cannot be subclassed. There is an issue to document 
which better. That does not mean that it is not a class.