Hi Nicolas!
> > sage: f._test_pickling()
> > Traceback (most recent call last):
> > ...
> > PicklingError: Can't pickle <type 'function'>: attribute lookup
> > __builtin__.function failed
>
> For this one, you can fake ``on_basis'' to be picklable using:
>
> sage: import __main__; __main__.on_basis = on_basis
I have been needing to define lots of morphisms using pure functions.
Here's a simple example: try to give every free module an identity morphism
in a way that passes pickling.
{{{
class ModulesWithBasis(Category_over_base_ring):
...
class ParentMethods:
...
def _identity_map(self):
def the_id(x):
return x
import __main__; __main__.the_id = the_id
return SetMorphism(Hom(self,self,self.category()),the_id)
}}}
This isn't going to work if the method is called multiple times
because the global reference will get overwritten.
Solutions?
--Mark
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