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An extension for IPython that help to use Fortran in your interactive session.

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

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.



see this notebook


You can install or upgrade via pip

pip install -U fortran-magic

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]: import sys

       if sys.platform.startswith("win"):
           # Depends of system, python builds, and compilers compatibility.
           # See `documentation.ipnb`.
           %fortran_config --fcompiler=gnu95 --compiler=mingw32

In[3]: %%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[4]:  f1(1.0, 2.1415)
Out[4]: 9.26574066397734e-05

See the documentation for further details.


0.8 / 2023-06-08

  • Fix use deprecating imp module (removed from Python 3.12b2)

  • Fix exponential duplication any not boolean flags of %%fortran_config

  • Include stored %%fortran_config’s args in hashing

  • Don’t rebuild cell if the module already loaded and hash not changed (Unix don’t reload already loaded shared library with same name. Windows can’t rewrite already loaded DLL)

  • Repair fortran highlighting in a %%fortran cell for nbclassic (Fortran highlighting for JupyterLab - unimplemented, for IPython 3.x - removed)

  • Printing compilers diagnostics for build errors by %%fortran without -vvv flag

Serguei E. Leontiev

0.7.1 / 2023-04-12

  • Synchronize version number in & (2023-04-10,

  • Patch fortran source in compiled object. (029d890, 2020-08-01,

  • Fix deprecation warning (3667bc1, 2017-08-18, [IPython.utils.path removed from IPython 8.x]

  • Simplify f2py execution. (d8a058f, 2016-06-04, Don’t change directories, and don’t mangle sys.argv. The former can be specified directly in the Popen constructor, and the latter is cruft from when the f2py module was imported directly.

0.7 / 2016-03-13

  • Fix cross compatibility with older NumPy and Python 3. (15ab10c)

Thanks to Elliott Sales de Andrade for this contribution

0.6 / 2015-12-02

  • Decode text before printing

  • Call f2py module instead of binary (numpy >=1.10 is mandatory)

  • Check if f2py command failed

Thanks to Juan Luis Cano Rodríguez for this contribution

0.5 / 2015-01-21

  • Call f2py via subprocess. It fixes problems finding fortran compilers under Windows. (Thanks to David Powell )

0.4.3 / 2013-12-09

  • Fix two python3.2+ incompatibilities (Thanks Ramon Crehuet for the report)

0.4.2 / 2013-10-08

  • Implement the --extra option (Thanks to Denis Vasilyev for the help)

  • Include %%fortran’s args in the hashing, so the same cell are recompiled with the same code but different arguments

0.3 / 2013-10-03

  • Added %fortran_config to set and persist default arguments for %%fortran

  • Improve documentation

0.2.1 / 2013-09-24

  • Packaged and registered in pypi

  • Starting a version’s changelog

0.2 / 2013-09-19

  • Fortran highlighting in a %%fortran cell

  • Works (or it should) in any platform (linux/windows/osx) and with py3 (thanks to Bradley Froehle)

  • Many f2py’s arguments exposed as magic arguments

  • Verbosity handling

  • Improved documentation

0.1 / 2013-09-08

  • First public release

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