#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: Detect and fix
public/ticket/10963 | Heisenbugs
Dependencies: #11224, #8327, | Commit:
#10193, #12895, #14516, #14722, | 8eaf51a82c4e2194769db13457979ae601ebbc04
#13589, #14471, #15069, #15094, | Stopgaps:
#11688, #13394, #15150, #15506 |
-------------------------------------+-------------------------------------
Comment (by SimonKing):
In `__classget__`, we find
{{{
#!python
if "_base_category_class_and_axiom" not in cls.__dict__:
cls._base_category_class_and_axiom = (base_category_class,
axiom_of_nested_class(base_category_class, cls))
cls._base_category_class_and_axiom_was_guessed = True
else:
assert cls._base_category_class_and_axiom[0] is
base_category_class, \
"base category class for %s mismatch; expected %s, got
%s"%(cls, cls._base_category_class_and_axiom[0], base_category_class)
}}}
What does that mean? Can `_base_category_class_and_axiom` be in the dict
before the call to the lazy class attribute is completed?
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:264>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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