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======================
Advanced F2PY usages
======================
Adding self-written functions to F2PY generated modules
=======================================================
Self-written Python C/API functions can be defined inside
signature files using ``usercode`` and ``pymethoddef`` statements
(they must be used inside the ``python module`` block). For
example, the following signature file ``spam.pyf``
.. include:: spam.pyf
:literal:
wraps the C library function ``system()``::
f2py -c spam.pyf
In Python:
.. include:: spam_session.dat
:literal:
Modifying the dictionary of a F2PY generated module
===================================================
The following example illustrates how to add an user-defined
variables to a F2PY generated extension module. Given the following
signature file
.. include:: var.pyf
:literal:
compile it as ``f2py -c var.pyf``.
Notice that the second ``usercode`` statement must be defined inside
an ``interface`` block and where the module dictionary is available through
the variable ``d`` (see ``f2py var.pyf``-generated ``varmodule.c`` for
additional details).
In Python:
.. include:: var_session.dat
:literal:
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