Python 3 bindings for PETSc libraries

 PETSc 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.
 .
 This is a base package that depends on the python3 petsc4py package
 with either real or complex number support. It provides the path to
 petsc4py for the system's default PETSc version set in
 /usr/lib/petsc. Export environment variable PETSC_DIR to use other
 versions.