cpython/Demo/embed/demo.c

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/* Example of embedding Python in another program */
#include "Python.h"
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static char *argv0;
void initxyzzy(); /* Forward */
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main(argc, argv)
int argc;
char **argv;
{
/* Save a copy of argv0 */
argv0 = argv[0];
/* Initialize the Python interpreter. Required. */
Py_Initialize();
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/* Add a static module */
initxyzzy();
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/* Define sys.argv. It is up to the application if you
want this; you can also let it undefined (since the Python
code is generally not a main program it has no business
touching sys.argv...) */
PySys_SetArgv(argc, argv);
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/* Do some application specific code */
printf("Hello, brave new world\n\n");
/* Execute some Python statements (in module __main__) */
PyRun_SimpleString("import sys\n");
PyRun_SimpleString("print sys.builtin_module_names\n");
PyRun_SimpleString("print sys.modules.keys()\n");
PyRun_SimpleString("print sys.argv\n");
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/* Note that you can call any public function of the Python
interpreter here, e.g. call_object(). */
/* Some more application specific code */
printf("\nGoodbye, cruel world\n");
/* Exit, cleaning up the interpreter */
Py_Exit(0);
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/*NOTREACHED*/
}
/* This function is called by the interpreter to get its own name */
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char *
getprogramname()
{
return argv0;
}
/* A static module */
static PyObject *
xyzzy_foo(self, args)
PyObject *self; /* Not used */
PyObject *args;
{
if (!PyArg_ParseTuple(args, ""))
return NULL;
return PyInt_FromLong(42L);
}
static PyMethodDef xyzzy_methods[] = {
{"foo", xyzzy_foo, 1},
{NULL, NULL} /* sentinel */
};
void
initxyzzy()
{
PyImport_AddModule("xyzzy");
Py_InitModule("xyzzy", xyzzy_methods);
}