#10963: More functorial constructions
-------------------------------------+-------------------------------------
Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.1
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues:
public/ticket/10963 | Commit:
Dependencies: #11224, #8327, | 0c907cf81efeb9bd2d0a44f73539c4e32583c1be
#10193, #12895, #14516, #14722, | Stopgaps:
#13589, #14471, #15069, #15094, |
#11688, #13394, #15150, #15506 |
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Comment (by elixyre):
Hi,
I would like to understand that:
{{{
sage: from sage.categories.category_with_axiom import
CategoryWithAxiom_over_base_ring
sage: class A(CategoryWithAxiom_over_base_ring):
....: pass
sage: class B(CategoryWithAxiom_over_base_ring):
....: pass
....:
sage: setattr(A, "B", B)
sage: getattr(A, "B")
ValueError Traceback (most recent call
last):
...
ValueError: could not infer axiom for the nested class <class
'__main__.B'> of <class '__main__.A'>
}}}
Why do we have this limitation?
Merry Christmas,
Jean-Baptiste
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Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:226>
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