Odd handling of type.__init__ bases

[Arnaud Delobelle]

On Feb 28, 10:50 pm, qu... at sparq.org wrote:
> I encountered an oddity in attempting to use a metaclass to perform mix-in
> inheritance for classes.  I've attached a small demonstration file.  Have I
> misunderstood the bases argument for type.__init__ or should this be submitted
> as a bug?

After a quick look at your example:

* you are mixing classic classes (abase) and new-style classes (A and
B), which often creates problems.

* type.__init__ does not set the base classes, type.__new__ does
this.  What you want to achieve could be done with:

class meta3(type):
    def __new__(cls, name, bases, dict):
        bases += (abase,)
        return type.__new__(cls, name, bases, dict)

HTH

--
Arnaud