example of fortran module to call within python
even in ifort, dont have to use DLLEXPORT but in main.py, should be large letter and attaching _ after module
e.g. subroutine hello_from_fortran (fortran program)
==> f.HELLO_FROM_FORTRAN_(*kargs)
compile option ifort -fPIC -shared -o libfort.so test.f90