#13835: pickle_function, unpickle_function don't handle default arguments
properly
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Reporter: cnassau | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-5.6
Component: pickling | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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The following came up in ticket #13814:
{{{#!python
sage: f = Permutations
sage: from sage.misc.fpickle import pickle_function, unpickle_function
sage: g = unpickle_function(pickle_function(f))
sage: print f(5)
Standard permutations of 5
sage: print g(5)
Traceback (most recent call last):
...
TypeError: Permutations() takes exactly 2 arguments (1 given)
}}}
Nicholas Thierry suggested to make this a separate ticket:
> Yes, this is definitely a misfeature with sage.misc.fpickle. It should
> be fixed to use standard pickling when it can (e.g. for a function
> defined in a library). And it should return something that can be
> unpickled with a plain loads. And, as mentioned in the code of family
> it should be registered to copy_reg so that it would be called
> automatically by dumps without needing to pollute one's code (like
> family) with it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13835>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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