1.4 The Module's Method Table and Initialization Function

I promised to show how spam_system() is called from Python programs. First, we need to list its name and address in a ``method table'':

static PyMethodDef SpamMethods[] = {
...
 {"system", spam_system, METH_VARARGS},
...
 {NULL, NULL} /* Sentinel */
};

Note the third entry ("METH_VARARGS"). This is a flag telling the interpreter the calling convention to be used for the C function. It should normally always be "METH_VARARGS" or "METH_VARARGS | METH_KEYWORDS"; a value of 0 means that an obsolete variant of PyArg_ParseTuple() is used.

When using only "METH_VARARGS", the function should expect the Python-level parameters to be passed in as a tuple acceptable for parsing via PyArg_ParseTuple(); more information on this function is provided below.

The METH_KEYWORDS bit may be set in the third field if keyword arguments should be passed to the function. In this case, the C function should accept a third "PyObject *" parameter which will be a dictionary of keywords. Use PyArg_ParseTupleAndKeywords() to parse the arguments to such a function.

The method table must be passed to the interpreter in the module's initialization function. The initialization function must be named initname(), where name is the name of the module, and should be the only non-static item defined in the module file:

void
initspam()
{
 (void) Py_InitModule("spam", SpamMethods);
}

Note that for C++, this method must be declared extern "C".

When the Python program imports module spam for the first time, initspam() is called. (See below for comments about embedding Python.) It calls Py_InitModule(), which creates a ``module object'' (which is inserted in the dictionary sys.modules under the key "spam"), and inserts built-in function objects into the newly created module based upon the table (an array of PyMethodDef structures) that was passed as its second argument. Py_InitModule() returns a pointer to the module object that it creates (which is unused here). It aborts with a fatal error if the module could not be initialized satisfactorily, so the caller doesn't need to check for errors.

When embedding Python, the initspam() function is not called automatically unless there's an entry in the _PyImport_Inittab table. The easiest way to handle this is to statically initialize your statically-linked modules by directly calling initspam() after the call to Py_Initialize() or PyMac_Initialize():

int main(int argc, char **argv)
{
 /* Pass argv[0] to the Python interpreter */
 Py_SetProgramName(argv[0]);

 /* Initialize the Python interpreter. Required. */
 Py_Initialize();

 /* Add a static module */
 initspam();

An example may be found in the file Demo/embed/demo.c in the Python source distribution.

Note: Removing entries from sys.modules or importing compiled modules into multiple interpreters within a process (or following a fork() without an intervening exec()) can create problems for some extension modules. Extension module authors should exercise caution when initializing internal data structures. Note also that the reload() function can be used with extension modules, and will call the module initialization function (initspam() in the example), but will not load the module again if it was loaded from a dynamically loadable object file (.so on Unix, .dll on Windows).

A more substantial example module is included in the Python source distribution as Modules/xxmodule.c. This file may be used as a template or simply read as an example. The modulator.py script included in the source distribution or Windows install provides a simple graphical user interface for declaring the functions and objects which a module should implement, and can generate a template which can be filled in. The script lives in the Tools/modulator/ directory; see the README file there for more information.

See About this document... for information on suggesting changes.

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