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September 2018

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forcallpy: embed Python, call Python scripts within Fortran programs
by Laurent Pointal Sept. 1, 2018

Sept. 1, 2018

Hello, Here is an announce for people with main Fortran programs who need to call Python scripts and do not want to start another process each time. Forcallpy embeds the Python interpreter in your Fortran program and makes scalars or one dimensional arrays of numbers easy to transmit between the two languages. It automatically install numpy in the Python side (used by this library), and support Python multithreading. Project git repository and bug tracking: https://sourcesup.renater.fr/projects/forcallpy/ Documentation: https://forcallpy.readthedocs.io/en/latest/ For an example, here is the Fortran demo program, without comments (more details in documentation about values transmission between Python and Fortran): PROGRAM forcallpy_demo USE forcallpy USE, INTRINSIC :: iso_c_binding, ONLY: c_ptr, c_null_ptr, c_loc IMPLICIT NONE INTEGER :: coderr INTEGER :: intres INTEGER,DIMENSION(10),TARGET :: tabint; DOUBLE PRECISION,DIMENSION(5),TARGET :: tabdbl; TYPE(c_ptr),DIMENSION(3) :: tabptr; DOUBLE PRECISION,DIMENSION(4),TARGET :: tabres; tabint(1:10) = (/ 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 /) tabdbl(1:5) = (/ 10.1, 10.3, 10.5, 10.7, 10.9 /) tabptr(1:3) = (/ c_null_ptr, c_null_ptr , c_null_ptr /) tabres(1:4) = (/ 0.0, 0.0, 0.0, 0.0 /) tabptr(2) = c_loc(tabdbl) CALL pyinit(register_sighandlers=1, print_errors=1, verbosity=0, & coderr=coderr) CALL pyrun_i4r8('print("result =",3 + 4 * x)', x=3.6D0) CALL pyrun_i4r8('for i in range(3): print("This is a Python loop", i, "directly in fortran source.")') CALL pyrun_i4r8('import math') CALL pyrun_i4r8('print("Pi value is", math.pi)') CALL pyrun_i4r8('import sys'//NEW_LINE('a')//'sys.path.insert(0, ".")') CALL pyrun_i4r8('import forcallpy_demomodule') CALL pyrun_i4r8('print("Doc forcallpy:", forcallpy.__doc__)') CALL pyrun_i4r8('print("Namespace forcallpy:", dir(forcallpy)') intres = pyfct_i4r8_i4(& "int(forcallpy_demomodule.a_function(a,b,c,x,av,zv,yw))", & a=2,b=-4,c=7,x=3.5D+0,av=tabint,zv=tabdbl,yw=tabres) WRITE(*,*) "Result =", intres WRITE(*,*) "Inout array after:", tabres CALL pysub_i4r8("forcallpy_demomodule.a_subroutine(av,zv,p)", & av=tabint,zv=tabdbl,p=tabptr) WRITE(*,*) "Computing a zero division in Python" CALL pysub_i4r8("print(1/0)") CALL pyrun_i4r8('forcallpy_demomodule.test_threading()') call sleep(10) CALL pyterm() END PROGRAM forcallpy_demo -- L.Pointal <laurent.pointal(a)limsi.fr> CNRS / LIMSI

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