#10353: Remove zodb from sage
-----------------------------------+----------------------------------------
Reporter: was | Owner: jason
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: misc | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: François Bissey | Merged in:
Dependencies: #12205 | Stopgaps:
-----------------------------------+----------------------------------------
Description changed by jdemeyer:
Old description:
> zodb only use the pickle protocol version 1. It is also not used in sage
> apart from one package that has been migrated away from it in #12205.
>
> There is a zodb mailing list discussion related to the pickle protocol
> here: http://www.mail-archive.com/[email protected]/msg04628.html
>
> In particular, pickle protocol 1 is hardcoded. But SageObjects/Cython
> objects must use protocol 2 in many cases:
> {{{
> sage: import cPickle
> sage: F = factor(12)
> sage: cPickle.dumps(F, protocol=0)
> TypeError: can't pickle SageObject objects
> sage: cPickle.dumps(F, protocol=1)
> TypeError: can't pickle SageObject objects
> sage: cPickle.dumps(F, protocol=2)
> '\x80\x02csage.structure.factorization\nFactorization\nq\x01)\x81q\x02}q\x03(U\x12_Factorization__crq\x04\x89U\x14_Factorization__unitq\x05csage.rings.integer\nmake_integer\nq\x06U\x011\x85Rq\x07U\x18_Factorization__universeq\x08csage.rings.integer_ring\nIntegerRing\nq\t)Rq\nU\x11_Factorization__xq\x0b]q\x0c(h\x06U\x012\x85Rq\rK\x02\x86q\x0eh\x06U\x013\x85Rq\x0fK\x01\x86q\x10eub.'
> }}}
>
> See also the related ticket #10352.
>
> The suggested option for this ticket is to remove zodb from sage.
> ----
> * Apply [attachment:trac10353-db-removal.patch] to the sage library
> * Apply [attachment:trac10353-sage_root.patch] to the sage root
> repository
New description:
zodb only use the pickle protocol version 1. It is also not used in sage
apart from one package that has been migrated away from it in #12205.
There is a zodb mailing list discussion related to the pickle protocol
here: http://www.mail-archive.com/[email protected]/msg04628.html
In particular, pickle protocol 1 is hardcoded. But SageObjects/Cython
objects must use protocol 2 in many cases:
{{{
sage: import cPickle
sage: F = factor(12)
sage: cPickle.dumps(F, protocol=0)
TypeError: can't pickle SageObject objects
sage: cPickle.dumps(F, protocol=1)
TypeError: can't pickle SageObject objects
sage: cPickle.dumps(F, protocol=2)
'\x80\x02csage.structure.factorization\nFactorization\nq\x01)\x81q\x02}q\x03(U\x12_Factorization__crq\x04\x89U\x14_Factorization__unitq\x05csage.rings.integer\nmake_integer\nq\x06U\x011\x85Rq\x07U\x18_Factorization__universeq\x08csage.rings.integer_ring\nIntegerRing\nq\t)Rq\nU\x11_Factorization__xq\x0b]q\x0c(h\x06U\x012\x85Rq\rK\x02\x86q\x0eh\x06U\x013\x85Rq\x0fK\x01\x86q\x10eub.'
}}}
See also the related ticket #10352.
The suggested option for this ticket is to remove zodb from sage.
----
* Apply [attachment:trac10353-db-removal.patch] to the sage library
* Apply [attachment:trac10353-sage_root.patch] to the sage root repository
* Remove the zodb package.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10353#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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