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To: python-list@python.org
From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: The type/object distinction and possible synthesis of OOP and imperative programming languages
Date: Tue, 16 Apr 2013 11:25:53 +0300
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On 16.04.13 07:46, Ian Kelly wrote:
> 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.

 >>> import builtins
 >>> for n in dir(builtins):
...     if type(getattr(builtins, n)) is type:
...         try:
...             t = type(n, (getattr(builtins, n),), {})
...         except TypeError as e:
...             print(e)
...
type 'bool' is not an acceptable base type
type 'memoryview' is not an acceptable base type
type 'range' is not an acceptable base type
type 'slice' is not an acceptable base type