> everything works well (no output), but when I run F._test_elements() I
> get an error in ... _test_category(). The precise error is listed
> below, but the traceback tells me that the problem arose in
> element.pyx:
>
> if not is_extension_type(self.__class__):
> # For usual Python classes, that should be done with
> # standard inheritance
> tester.assert_(isinstance(self,
> self.parent().category().element_class))
>
> Did I mess up with my use of the sage categories somewhere? Any help
> would be much appreciated, and I can readily supply additional
> information.
Did you tell the parent what is the class of its elements ? Specifically when
creating a parent with the category framework you need either to write
class MyParentClass(...):
...
class Element(...):
...
Or else
class MyElementClass(...):
...
class MyParentClass(...):
...
Element = MyElementClass
Then the category framework create for you a dynamic class called
MyParentClass.element_class
Hope this helps,
Cheers,
Florent
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