Hi Viviane,
On 2015-06-11, Viviane Pons <[email protected]> wrote:
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>
> Yes, but my problem is that I am inheriting in a file and that is not
> working at the moment. I did in the command line to show the error, but
> actually I cannot make it work on a simple file:
>
> I have a file containing only this:
>
> from sage.categories.graded_algebras import GradedAlgebras
>
> class Facade_polynomial_ring(GradedAlgebras):
> pass
Why do you want to create a sub-class of GradedAlgebras?
First of all, it looks like you want to create a polynomial ring, not a
category. And if you really want to create a category, then I think you
should not form a sub-class of an existing category-class, but you
should have
class MyCategory(Category):
bla
(respectively CategoryWithAxiom respectively its singleton
counterparts).
I suppose you know that for creating a sub-category one should implement
(extra_)super_categories, but not form a sub-class of another category
class.
Best regards,
Simon
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