[Cython] Problems with creating a package of extension modules

[Robert Bradshaw]

On May 1, 2009, at 10:15 AM, Simon King wrote:

> Dear Cython-Dev,
>
> currently I try to create a Cython package comprising couple of  
> extension
> modules for usage in Sage. It somehow works, but apparently the  
> extension
> classes in the modules don't know where they belong to.
>
> In my setup.py, I have
> setup(
>   name = "pGroupCohomology",
>   version = "1.0",
>   author = "Simon A. King",
>   author_email = "simon.king at uni-jena.de",
>   url = "http://users.minet.uni-jena.de/~king/cohomology/",
>   description = "Modular Cohomology Rings of Groups of Prime Power  
> Order",
>   packages=["pGroupCohomology"],
>   package_dir={"pGroupCohomology":"CohoSrc"},
>   ext_package="pGroupCohomology",
>   ext_modules=[
>     Extension("mtx",
>               sources = ["CohoSrc/mtx.pyx",
>                          ...],
>               ...),
>     Extension(...)]
>   cmdclass = {'build_ext': build_ext}
> )
>
> I learned from some documentation that providing the optional argument
> 'ext_package' should make the Extensions modules in that package,  
> so, it should
> be Extension("mtx",...), not Extension("pGroupCohomology.mtx",...).

Hmm... could you point me to that bit of documentation? I think it's  
wrong (or at least not implemented as explained), we do Extension 
("package.module",...) all the time in sage and that seems to mix  
well with pickling.

- Robert