[petsc-users] PetscPythonInitialize, KSPPYTHON, PCPYTHON, etc

[Matthew Knepley]

On Wed, Mar 12, 2025 at 4:34 PM Eric Chamberland via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hi,
>
> just a naive question: looking at KSPPYTHON and PCPYTHON, we saw that
> there is only 1 example available.
>
> We are asking ourself: is it still supported and can we start
> developping ou PCs and KSPs on top of it?
>
> Or is there a "new" replacement for these?
>

I think the reason that there are so few examples is that many examples
exist in other packages, such as Firedrake, and they are the main
consumers. KSPPYTHON is a way to write KSPSHELL using Python rather than C,
and we mostly write C.

I will say that recently we fixed everything so that PETSc errors and
Python exceptions are passed correctly up the stack, and debugging these
things should be easy. I have been debugging the PyVista visualization, and
I can change the Python in one window and run in the other. It is easy.

  Thanks,

     Matt


> Thanks,
>
> Eric
>
> --
> Eric Chamberland, ing., M. Ing
> Professionnel de recherche
> GIREF/Université Laval
> (418) 656-2131 poste 41 22 42
>
>

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

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