This is from the "report a problem" link in the notebook:
If you have a vector space, that is a quotient of a subspace of
another vector space, then after coercing elements into it, something
goes wrong in (un)pickling it.
{{{
sage: V = VectorSpace(QQ, 2)
sage: W = V.subspace([V([1,1])])
sage: Z = W.subspace([])
sage: WmodZ = W / Z
sage: WmodZ(W(0))
(0)
sage: loads(dumps(WmodZ))
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/bosman/sage/<ipython console> in <module>()
/home/bosman/sage-4.2-linux-Ubuntu_9.04-i686-Linux/local/lib/python2.6/site-packages/sage/structure/sage_object.so
in sage.structure.sage_object.loads
(sage/structure/sage_object.c:8769)()
/home/bosman/sage-4.2-linux-Ubuntu_9.04-i686-Linux/local/lib/python2.6/site-packages/sage/modules/free_module.pyc
in __hash__(self)
4576 True
4577 """
-> 4578 return hash(self.__basis)
4579
4580 def construction(self):
AttributeError: 'FreeModule_submodule_field' object has no attribute
'_FreeModule_submodule_with_basis_pid__basis'
}}}
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