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Tue Jun 22 14:48:25 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-June/100897.html

2010/6/22 Raymond Hettinger <raymond.hettinger at gmail.com>:
> There's an entry in whatsnew for 2.7 to the effect of "The UserDict class is
> now a new-style class".
> I had thought there was a conscious decision to not change any existing
> classes from old-style to new-style.  IIRC, Martin had championed this idea
> and had rejected all of proposals to make existing classes inherit from
> object.

IIRC this was because UserDict tries to be a MutableMapping but abcs
require new style classes.

-- 
Regards,
Benjamin

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[Python-Dev] UserDict in 2.7