Why new Python 2.5 feature "class C()" return old-style class ?

[Aahz]

In article <e1kq0c$cvf$1 at news.contactel.cz>,
Petr Prikryl <prikryl at skil.cz> wrote:
>"Aahz" wrote...
>> Bruno Desthuilliers wrote:
>>>Aahz a écrit :
>>>>
>>>> Classic classes are *NOT* deprecated.
>>>
>>>Perhaps not *officially* yet...
>>
>> Not even unofficially.  The point at which we have deprecation is when
>> PEP8 gets changed to say that new-style classes are required for
>> contributions.
>
>My question: Could the old classes be treated in a new Python treated
>as new classes with "implicit" base object? (I know the Zen... ;-)
>
>Example: I use usually a very simple classes. When I add "(object)" to
>my class definitions, the code continues to works fine -- plus I have
>new features to use.  Why this cannot be done automatically? What could
>be broken in the old code if it was threated so?

Method resolution order is the primary up-front difference, but
introspective code can also have problems.  If you're tired of adding
"(object)", put

__metaclass__ = type

at the top of your modules.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

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