Hi Javier,
On 7 Dez., 07:30, Florent Hivert <florent.hiv...@lri.fr> wrote:
> I think the reason for the failure is that your code assumed that other is
> also a conjugacy class.
You *can* assume that, if you use the base classes in
sage.structure.element and sage.structure.parent!
But I wonder: Is your code Cython or Python? And do you use Sage's
coercion model properly?
Namely, look into sage/structure/element.pyx. There is a comment
explaining what you need to do for comparison in Python or in Cython
(that's different, unfortunately!).
The comment is
####################################################################
# For a derived Cython class, you **must** put the following in
# your subclasses, in order for it to take advantage of the
# above generic comparison code.
Meaning: It is not enough that the methods following the comment are
inherited - you must explicitly repeat them, if you use Cython.
# For a *Python* class just define __cmp__ as always.
# But note that when this gets called you can assume that
# both inputs have identical parents.
#
# If your __cmp__ methods are not getting called, verify that the
# canonical_coercion(x,y) is not throwing errors.
#
####################################################################
So, Python is a little easier.
But in both cases, it is also assumed that you are using coercion.
Hence, when the test "self==None" raises an error or returns a wrong
result then it could also be that there is a wrong coercion.
Best regards,
Simon
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