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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Chanelling Guido - dict subclasses
Date: Tue, 14 Jan 2014 22:48:09 -0500
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On 1/14/2014 8:27 PM, Steven D'Aprano wrote:

> In the midst of that discussion, Guido van Rossum made a comment about
> subclassing dicts:
>
>      [quote]
>      From: Guido van Rossum <guido@python.org>
>      Date: Tue, 14 Jan 2014 12:06:32 -0800
>      Subject: Re: [Python-Dev] PEP 460 reboot
>
>      Personally I wouldn't add any words suggesting or referring
>      to the option of creation another class for this purpose. You
>      wouldn't recommend subclassing dict for constraining the
>      types of keys or values, would you?
>      [end quote]
>
> https://mail.python.org/pipermail/python-dev/2014-January/131537.html
>
> This surprises me,

I was slightly surprised too. I understand not wanting to add a subclass 
to stdlib, but I believe this was about adding words to the doc. Perhaps 
he did not want to over-emphasize one particular possible subclass by 
putting the words in the doc.

-- 
Terry Jan Reedy