[petsc-users] Extending petsc4py

[Ingo Gaertner]

Hello,
can I find somewhere an example how to wrap my own PETSc-based code so that
it can be used together with petsc4py?

Let's assume I have a C function, which I want to access from python:
Vec createMyVec();

I have written a SWIG interface file to generate a python wrapper for this
function. The wrapper works, but I cannot use the return value as input for
mpi4py routines that expect a Vec, because mpi4py's Vec type is different
from the SWIG generated Vec type in my python wrapper. Any idea, how I can
create mpi4py-compatible types?

If the mpi4py wrapping technique is described somewhere, this may help as
well, although some working example would be perfect.

As a final remark, I'd like to keep my project decoupled from mpi4py.
Therefore, including my extensions in the build process of mpi4py is not
quite what I am looking for, although I could live with this as a
workaround if no other solution is possible.
(I am using petsc-3.9.1 built from source and mpi4py installed using pip on
Ubuntu 18.04.)

Thanks
Ingo
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