[Python-Dev] UserDict in 2.7

[Benjamin Peterson]

2010/6/22 Raymond Hettinger <raymond.hettinger at gmail.com>:
>
> On Jun 22, 2010, at 5:48 AM, Benjamin Peterson wrote:
>
>> 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.
>
> ISTM, this change should be reverted to the way it was in 2.6.
>
> The registration was already working fine:

Actually I believe it was an error that it could. There was a typo in
abc.py which prevented it from raising errors when non new-style class
objects were passed in.



-- 
Regards,
Benjamin