#6670: Port group algebras to the current coercion system
-----------------------------------+----------------------------------------
Reporter: mraum | Owner: mraum
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-4.5
Component: algebra | Keywords:
Author: Martin Raum | Upstream: N/A
Reviewer: | Merged:
Work_issues: unpickling problems |
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Changes (by davidloeffler):
* work_issues: => unpickling problems
Comment:
I spent quite a while rebasing this to 4.5.alpha1. I will upload the
rebased patch; but I was disappointed to find that there is still a
serious issue that needs to be addressed.
The problem is that unpickling elements of group algebras created using
the old code fails; you can't replace a class name with a function name
and expect it to unpickle seamlessly. It ends up expecting
{{{sage.algebras.group_algebra.GroupAlgebraElement}}} to be a class which
can just be filled in with the pickled {{{__dict__}}} values, not a
callable. This is what I get if I pickle a group algebra element without
the patch, apply the patch and try to unpickle:
{{{
sage: load("/home/masiao/gpalg.sobj")
---------------------------------------------------------------------------
UnpicklingError Traceback (most recent call
last)
/storage/masiao/sage-4.5.alpha1/devel/sage-
reviewing/sage/algebras/<ipython console> in <module>()
/storage/masiao/sage-4.5.alpha1/local/lib/python2.6/site-
packages/sage/structure/sage_object.so in sage.structure.sage_object.load
(sage/structure/sage_object.c:7577)()
/storage/masiao/sage-4.5.alpha1/local/lib/python2.6/site-
packages/sage/structure/sage_object.so in sage.structure.sage_object.loads
(sage/structure/sage_object.c:9175)()
UnpicklingError: NEWOBJ class argument isn't a type object
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6670#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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