[bug#33059] [PATCH 02/10] gnu: Add python-petsc4py.

[Paul Garlick]

* gnu/packages/simulation.scm (python-petsc4py): New variable.
---
 gnu/packages/simulation.scm | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/gnu/packages/simulation.scm b/gnu/packages/simulation.scm
index 857d856..3f6b73f 100644
--- a/gnu/packages/simulation.scm
+++ b/gnu/packages/simulation.scm
@@ -35,6 +35,7 @@
   #:use-module (gnu packages mpi)
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages ncurses)
+  #:use-module (gnu packages python)
   #:use-module (gnu packages readline)
   #:use-module (gnu packages ssh)
   #:use-module (gnu packages tls)
@@ -264,3 +265,40 @@ supports point-to-point and collective communications of 
any picklable Python
 object as well as optimized communications of Python objects (such as NumPy
 arrays) that expose a buffer interface.")
     (license license:bsd-3)))
+
+(define-public python-petsc4py
+  (package
+    (name "python-petsc4py")
+    (version "3.9.1")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "petsc4py" version))
+        (sha256
+          (base32
+            "1f8zd1ac9irsgkyqmzq30d9kl10fy1nh6zk312dhs43g449fkkhc"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'build 'pre-build
+           (lambda _
+             ;; Define path to PETSc installation.
+             (setenv "PETSC_DIR" (assoc-ref %build-inputs "petsc"))
+             #t))
+         (add-before 'check 'mpi-setup
+           ,%openmpi-setup))))
+    (inputs
+     `(("petsc" ,petsc-openmpi)
+       ("python-numpy" ,python-numpy)))
+    (home-page
+      "https://bitbucket.org/petsc/petsc4py/";)
+    (synopsis "Python bindings for PETSc")
+    (description "PETSc, the Portable, Extensible Toolkit for
+Scientific Computation, is a suite of data structures and routines for
+the scalable (parallel) solution of scientific applications modeled by
+partial differential equations.  It employs the MPI standard for all
+message-passing communication.  @code{petsc4py} provides Python
+bindings to almost all functions of PETSc.")
+    (license license:bsd-3)))
+ 
-- 
1.8.3.1