I'm working on points and morphisms of projective space with #15780 and
I've come across an issue that is related to save/load. So, I've been
experimenting try to see what works and what doesn't and I've come to the
conclusion that I don't really know how it works. Here are two examples,
one of which works, one of which doesn't.
If I try to save a list of projective points it failes. But if I make a
projective function the first entry (but not the 2nd or 3rd), then it
works. If there is only one point in the list it also works. Otherwise I
get an error like:
Traceback (most recent call last): f=H([x^2-y^2,y^2])
File "", line 1, in <module>
File "/tmp/tmpdpkZt2/___code___.py", line 12, in <module>
exec compile(u'load(objfile_short)
File "", line 1, in <module>
File "sage_object.pyx", line 862, in sage.structure.sage_object.load
(sage/structure/sage_object.c:9774)
File "sage_object.pyx", line 1236, in sage.structure.sage_object.loads
(sage/structure/sage_object.c:11522)
File "element.pyx", line 404, in
sage.structure.element.Element.__setstate__ (sage/structure/element.c:4342)
File "element.pyx", line 268, in
sage.structure.element.Element._set_parent (sage/structure/element.c:3664)
TypeError: Cannot convert dict to sage.structure.parent.Parent
here are the two examples
{{{
objfile = os.path.join(SAGE_TMP, 'test.sobj')
objfile_short = os.path.join(SAGE_TMP, 'test')
P.<x,y>=ProjectiveSpace(QQ,1)
H=End(P)
Q=P(1)
R=P(2)
f=H([x^2-y^2,y^2])
r=[f,R,Q]
save(r, objfile)
load(objfile_short)
}}}
{{{
objfile = os.path.join(SAGE_TMP, 'test.sobj')
objfile_short = os.path.join(SAGE_TMP, 'test')
P.<x,y>=ProjectiveSpace(QQ,1)
H=End(P)
Q=P(1)
R=P(2)
f=H([x^2-y^2,y^2])
r=[Q,R]
save(r, objfile)
load(objfile_short)
}}}
If someone could explain to me why this is failing that would be very
helpful. Or even point me to where to look in the source to track this down.
Thanks,
Ben
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