On Friday, October 7, 2016 at 10:47:55 AM UTC-7, John H Palmieri wrote: > > TypeError: Error when calling the metaclass bases > metaclass conflict: the metaclass of a derived class must be a > (non-strict) subclass of the metaclasses of all its bases > Yes, python doesn't support multiple metaclass inheritance (its design really prevents it), so I'd think this is a hard obstruction.
sage: M=UniqueRepresentation.__metaclass__ sage: M.mro(M) [<type 'sage.misc.classcall_metaclass.ClasscallMetaclass'>, <type 'sage.misc.nested_class.NestedClassMetaclass'>, <type 'type'>, <type 'object'>] sage: E=Element.__getmetaclass__(1) sage: E.mro(E) [<type 'sage.misc.inherit_comparison.InheritComparisonMetaclass'>, <type 'type'>, <type 'object'>] prior to https://trac.sagemath.org/ticket/18329 your example worked. Of course, if you want UniqueRepresentation (do you really want that? it's got a lot of drawbacks) you wouldn't really care about inheriting comparison, but that doesn't help you. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
