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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sun, 11 Mar 2012 05:52:48 -0600
Subject: Re: newb __init__ inheritance
To: hyperboogie <hyperboogie@gmail.com>
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On Sun, Mar 11, 2012 at 5:40 AM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> 2. Is the mro function available only on python3?
>
> No, but it is available only on new-style classes. =A0If you try it on a
> classic class, you'll get an AttributeError.

And by the way, you probably shouldn't call the mro method directly.
That method is provided so that it can be overridden in order to
customize the MRO at class creation.  The proper (and faster) way to
look up the MRO for a class is using the __mro__ attribute, which
stores the result of the mro method when the class is initialized.

http://docs.python.org/library/stdtypes.html?highlight=3Dmro#class.__mro__

Cheers,
Ian