Fortran magic

Compile and import symbols from a cell with Fortran code, using f2py.

Attention: I am looking for collaborators to maintain this project. If you are interested, please open an issue (or PRs) with your proposals for improvements and volunteer to be a maintainer.

The contents of the cell are written to a .f90 file in the directory IPYTHONDIR/fortran using a filename with the hash of the code. This file is then compiled. The resulting module is imported and all of its symbols are injected into the user's namespace.

• Homepage: https://github.com/mgaitan/fortran_magic
• Documentation: see this notebook

Install

You can install or upgrade via uv:

uv add fortran-magic

Or via pip:

pip install -U fortran-magic

Or run directly

uv run --with=fortran-magic ipython

Basic usage

Once it's installed, you can load it with %load_ext fortranmagic. Then put your Fortran code in a cell started with the cell magic %%fortran. For example:

In[1]: %load_ext fortranmagic

In[2]: %%fortran

       subroutine f1(x, y, z)
            real, intent(in) :: x,y
            real, intent(out) :: z

            z = sin(x+y)

       end subroutine f1

Every symbol is automatically imported. So the subroutine f1 is already available in your python session as a function:

In[3]:  f1(1.0, 2.1415)
Out[3]: 9.26574066397734e-05

Tests

Run tests with:

uv run --group dev pytest

See the documentation for further details.