Hi Martin,
On 2016-11-08, 'Martin R' via sage-devel <sage-devel@googlegroups.com> wrote:
> That's actually precisely what I'd like. So, what are metaclass conflicts?
Many classes in Sage have metaclasses, such as: Everything that inherits
from sage.structure.element.Element or from
sage.structure.unique_representation.UniqueRepresentation (which is most
parents and all categories).
Now, if you want to create a new class with more than one base class,
i.e.
class C(B1,B2,B3):
pass
and if the metaclasses M1,M2,M3 of B1,B2,B3 are incompatible (in the
sense that none of M1,M2,M3 is a subclass of the other two metaclasses),
then Python will throw up an error --- unless you explicitly specify a
metaclass for C that is a subclass of M1, M2 and M3.
Cheers,
Simon
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