Outline of the interface file

The interface applies a Fortran 90 module (class) syntax
Each function/subroutine, its arguments and its return value is specified: 
python module hw ! in 
    interface  ! in :hw
        ...
        subroutine hw3(r1,r2,s) ! in :hw:hw.f
            real*8 :: r1
            real*8 :: r2
            real*8 :: s
        end subroutine hw3
    end interface 
end python module hw
(Fortran 90 syntax)

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