#17558: pickled function loses its args
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Reporter: wonder | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: pickling | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:1 wonder]:
> Possibly related to #17503 (pickled symbolic function breaks maxima
interface)
Indeed, I suspect it's related in the sense that pickling of symbolic
expressions seems to rely entirely one Pynac serialization and doesn't
take into account the properties of the python objects involved. In
particular, the difference between a callable and a normal symbolic
expression seems to lie entirely in the parent:
{{{
sage: var('u_0 u_1 x y')
(u_0, u_1, x, y)
sage: f2u = (1 - u_0).function(u_0, u_1)
sage: parent(f2u)
Callable function ring with arguments (u_0, u_1)
sage: parent(f2u(u_0,u_1))
Symbolic Ring
sage: f2u(u_0,u_1).__reduce_ex__(2) == f2u.__reduce_ex__(2) #this confirms
that they pickle to the same.
True
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17558#comment:2>
Sage <http://www.sagemath.org>
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