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From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Subject: Re: subclassable types
Date: Sun, 24 Feb 2013 16:38:53 +0000 (UTC)
References: <loom.20130222T101853-588@post.gmane.org> <kg8qcn$km8$1@ger.gmane.org> <loom.20130224T171121-218@post.gmane.org>
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Xref: csiph.com comp.lang.python:39756

> The complete list of types classes that *cannot* be subclassed is:
> 
> <class 'builtin_function_or_method'>
> <class 'code'>
> <class 'frame'>
> <class 'function'>
> <class 'generator'>
> <class 'getset_descriptor'>
> <class 'function'>
> <class 'mappingproxy'>
> <class 'member_descriptor'>
> <class 'method'>
> <class 'traceback'>
> <class 'range'>
> <class 'memoryview'>
> <class 'slice'>
> <class 'bool'>
> 
> of these range, memoryview, slice and bool are the only ones in builtins. 

I am sorry,
but again I forgot to say which Python version I'm referring to:
I used Python 3.3 :)

Having such a list in the docs somewhere, is certainly a good idea.

Cheers,
Wolfgang