raising an exception when multiple inheritance involves same baseThank

[Gabriel Genellina]

En Sun, 25 May 2008 13:32:39 -0300, Paul McGuire <ptmcg at austin.rr.com> escribió:

> Here's a more general version of your testing code, to detect *any*
> diamond multiple inheritance (using your sample classes).
>
> for cls in (A,B,C,D):
>     seen = set()
>     try:
>         bases = cls.__bases__
>         for b in bases:
>             if hasattr(b,"__mro__"):
>                 for m in b.__mro__:
>                     if m in seen:
>                         raise Exception("diamond multiple
> inheritance")
>                     seen.add(m)
>     except Exception, e:
>         print cls,"has diamond MI"
>     else:
>         print cls,"is ok"

I think you should exclude the `object` class from the test, because all new-style classes inherit from it and *every* case of multiple inheritance forms a diamond.

-- 
Gabriel Genellina