[Python-Dev] python and super

[Greg Ewing]

Mark Shannon wrote:

>>>> class A: pass
>>>> class B(A): pass
>>>> class C(A,B):pass
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: Cannot create a consistent method resolution
> order (MRO) for bases B, A

All right, but this is okay:

class C(B, A): pass

 > Michael Foord wrote:
 >
>> For a super call in C, B is a sibling to A. For a super call in B, A 
>> is a parent.
>>
>> With the semantics I was suggesting if C calls super, but A doesn't 
>> then B would still get called.

which is contradicted by:

> "Siblings", in the context of a single MRO  are thus classes between 
> which there is no sub-class/super-class relation.

So I maintain that the situation is far from clear. :-)

-- 
Greg