Interfacing Fortran with Python in 2025

[fracton]

@ivanpribec

You could stick with pybind11 and just use gfortran to write the C headers for your bind(c) procedures (the ones implemented in Fortran):

Among Fortran compilers, gfortran can be instructed to emit C function prototypes which can be put in a header file. Here’s how to do it with gfortran (see section Options for interoperability with other languages): $ gfortran -fc-prototypes -fsyntax-only foo.f90 > foo.h As an example, running the command above on the file ! foo.f90 module foo use, intrinsic :: iso_c_binding, only: c_float implicit none contains real(c_float) function foo_sqr(x) bind(c) real(c_float), intent(in) :: …

However, in retrospect I think it may not be a bad idea to wrap a Fortran shared object using cffi, as it may provide a more native interface (lower level) with python.