#7929: Pickling fails for some residue fields
-----------------------------+----------------------------------------------
Reporter: nthiery | Owner: davidloeffler
Type: defect | Status: new
Priority: major | Milestone:
Component: number fields | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
-----------------------------+----------------------------------------------
Description changed by nthiery:
Old description:
> Catched with #7921:
>
> {{{
> sage: K.<a> = NumberField(x^3-17)
> sage: P = K.ideal(29).factor()[0][0]
> sage: k = K.residue_field(P) # indirect doctest
> sage: F = ZZ.residue_field(17) # indirect doctest
> sage: loads(dumps(k))
> ------------------------------------------------------------
> Traceback (most recent call last):
> File "<ipython console>", line 1, in <module>
> File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
> (sage/structure/sage_object.c:8021)
> File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
> (sage/rings/ring.c:12853)
> TypeError: 'NoneType' object is unsubscriptable
>
> sage: loads(dumps(k.an_element()))
> ------------------------------------------------------------
> Traceback (most recent call last):
> File "<ipython console>", line 1, in <module>
> File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
> (sage/structure/sage_object.c:8021)
> File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
> (sage/rings/ring.c:12853)
> TypeError: 'NoneType' object is unsubscriptable
>
> sage: loads(dumps(F))
> ------------------------------------------------------------
> Traceback (most recent call last):
> File "<ipython console>", line 1, in <module>
> File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
> (sage/structure/sage_object.c:8021)
> File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
> (sage/rings/ring.c:12853)
> TypeError: 'NoneType' object is unsubscriptable
>
> sage: loads(dumps(F.an_element()))
> ------------------------------------------------------------
> Traceback (most recent call last):
> File "<ipython console>", line 1, in <module>
> File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
> (sage/structure/sage_object.c:8021)
> File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
> (sage/rings/ring.c:12853)
> TypeError: 'NoneType' object is unsubscriptable
> }}}
New description:
Caught with #7921; please write patch on top of it to avoid conflicts.
{{{
sage: K.<a> = NumberField(x^3-17)
sage: P = K.ideal(29).factor()[0][0]
sage: k = K.residue_field(P) # indirect doctest
sage: F = ZZ.residue_field(17) # indirect doctest
sage: loads(dumps(k))
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
(sage/structure/sage_object.c:8021)
File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
(sage/rings/ring.c:12853)
TypeError: 'NoneType' object is unsubscriptable
sage: loads(dumps(k.an_element()))
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
(sage/structure/sage_object.c:8021)
File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
(sage/rings/ring.c:12853)
TypeError: 'NoneType' object is unsubscriptable
sage: loads(dumps(F))
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
(sage/structure/sage_object.c:8021)
File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
(sage/rings/ring.c:12853)
TypeError: 'NoneType' object is unsubscriptable
sage: loads(dumps(F.an_element()))
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File "sage_object.pyx", line 740, in sage.structure.sage_object.dumps
(sage/structure/sage_object.c:8021)
File "ring.pyx", line 2424, in sage.rings.ring.FiniteField.__reduce__
(sage/rings/ring.c:12853)
TypeError: 'NoneType' object is unsubscriptable
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7929#comment:1>
Sage <http://www.sagemath.org>
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and MATLAB
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