F2PY

<<TableOfContents(4)>>

A tool that provides connection between Python and Fortran languages [[http://www.scipy.org/F2py|Official website]]

[[http://websrv.cs.umt.edu/isis/index.php/F2py_example|Advanced examples how to use f2py]]

{{{
Type:

f2py # to see the usage options
f2py -c --help-fcompiler # to see what local fortran compilers does f2py recognize
}}}
f2py wraps Fortran code and allows to use it as a Python module.

== "Hello world" ==
{{{
C File hello_world.f
      subroutine foo (a)
      integer a
      print*, "Hello from Fortran!"
      print*, "a=",a
      end
}}}
Compile:

{{{
f2py -c -m hello hello.f --fcompiler=gfortran
}}}
Try it in Python:

{{{
import hello
print hello.__doc__
hello.foo(4)
}}}

== Compare pure Python and Python+Fortran ==

file (watermask, 10x10 degrees, 250m resolution):  {{{/home/zmaw/m300036/PythonSeminar/watermask/MOD44W.A2000055.h18v04.005.2009212173853.hdf}}}


Real world example: moving window averaging

 * Fortran code: [[ /ArStats | code ]]
 * Python code: [[/ResizeWaterMaskPython | code]]
 * Fortran+Python: [[ /ResizeWaterMaskFortran | code]]