I just discovered here recently, very glad that there is a community to discuss about Fortran. Most of time I use python for visualization or some simple calculation. Of course I sometimes encounter performance problems and I just wonder if I can call Fortran subroutines or functions in python to s…

Thanks for the question @CYehLu and welcome to the forum! Yes, your question is on topic here, I am glad you asked. The f2py approach I think should be faster. Another fast approach is using Cython or the C/API directly, see here how to do it: Fortran Best Practices — Fortran90 1.0 documentation A…

Thanks for the reply! Very helpful. I have no experience in using C/API to call C function in python. I found this example , is it the method to interact with fortran subroutines/functions through C/API? Also I’m not fully understand the explanation you mentioned about. You mentioned that “The ctyp…

[image] CYehLu: I found this example , is it the method to interact with fortran subroutines/functions through C/API? I think so. I personally prefer to use Cython, that essentially generates such a C/API file for you. [image] CYehLu: $ gfortran -shared -fPIC test.f90 -o test.so to compi…

[image] Interfacing Fortran code from Python Help I’m a Python programmer looking to Fortran as a way to speed up code that couldn’t be handled by array operations with Numpy and SciPy. (There are of course many other ways you can do this but I was also motivated to learn …

Thanks to @certik and @awvwgk ! Very helpful, I think I should continue to use f2py as my fortran subroutines/functions wrapper. Other tools like pyccel seems very interesting and I think I can try to use it. Thanks again, very glad to come to here.

@CYehLu Did you try numba? I have slightly modified your code ( I assume that using np.arrays instead of lists is allowed in “pure” python version) import numpy as np from numba import njit def vorticity_py(u, v, dx, dy): ny, nx = u.shape vort = np.zeros((ny, nx)) dx2 = dx * 2 dy2 = d…

Hi @Dobrodzieju Yes I have tried numba and I sometimes use it to speed up my python code. But sometimes a function will be executed only once (but cost lot of time), then numba is not very suitable because it has to compile when I execute it for the first time. I just knew that numba also offers A…

Interact with python -- f2py or ctypes?

Help

awvwgk July 30, 2021, 11:08am 5

This thread should answer some of your questions, we started writing up some of the details for the different approaches but there is no final guide yet.

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Interact with python -- f2py or ctypes?

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