The following code is pretty much straight out of
section 1.2.1.1 of the Python/C reference manual:
#include <Python.h>
int
main(void)
{
PyObject *l, *x;
Py_Initialize();
l = PyList_New(3);
x = PyInt_FromLong(1L);
if (l == NULL || x == NULL) {
PyErr_Print();
exit (EXIT_FAILURE);
}
PySequence_SetItem(l, 0, x);
Py_DECREF(x);
Py_Finalize();
return EXIT_SUCCESS;
}
Unforunately, it doesn't work. It segfaults, and
the error occurs in list_ass_item() when the
Py_DECREF macro is applied to old_value, which
was set at line 699 of Objects/listobject.c
with old_value = a->ob_item[i]; (old_value is
being set to NULL, and Py_DECREF is
being applied to NULL...boom!)
I'm totally new to embedding/extending python,
so I'm not sure if I'm doing something incredibly
stupid, but it certainly looks like PySequence_SetItem()
was expecting that there should already be an
item at the desired index.
Am I doing something stupid?
--
Bill Pursell
--
http://mail.python.org/mailman/listinfo/python-list
