Python 3 bindings for SLEPc libraries

 SLEPc is the Scalable Library for Eigenvalue Problem Computations.
 .
 It is based on PETSc and employs the MPI standard for all
 message-passing communication.
 .
 This is a base package that depends on (Recommends) the python3
 slepc4py package with either real or complex number support. It
 provides the path to slepc4py for the system's default SLEPc version
 set in /usr/lib/slepc. Export environment variable SLEPC_DIR to use
 other versions.