Dear Sage support,
as much as I know, I was raising a similar question before. But
actually I never got a successful solution for the following problem
(and "Search Sage Resources" didn't help either):
I have a Cython extension class that describes elements of some ring.
Thus, it should inherit from RingElement.
The following does not work:
from sage.structure.element import RingElement
cdef class MyClass(RingElement):
I was told that a Cython class can not inherit from a Python class,
so, I have to *c*import RingElement.
However, the cimport does not work:
from sage.structure.element cimport RingElement
yields complaints that 'sage.structure.element.pxd' can't be found.
OK, probably I have to provide the appropriate include path. Robert
Bradshaw suggested off list to add SAGE_ROOT+"/devel/sage/" as include
directory.
But even when I added the *full* path to element.pxd into my setup.py
(option "include_dirs" of Extension), it did not work.
Very strange, since of course a lot of sage modules cimport
RingElements without problems.
So, in a nutshell: How can I cimport a Cython class from Sage (when I
am not in the devel tree, if that matters)? What include_dirs do I
need to provide?
Best regards,
Simon
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