#include <Python.h>
#include "Quantuccia/ql/time/calendars/unitedstates.hpp"

static PyObject*
get_holiday_date(PyObject *self, PyObject *args)
{
    return Py_None;
}
 
static PyMethodDef QuantucciaMethods[] = {
	{"get_holiday_date", (PyCFunction)get_holiday_date, METH_VARARGS, NULL},
	{NULL, NULL, 0, NULL}
};

static struct PyModuleDef quantuccia_module_def = {
	PyModuleDef_HEAD_INIT,
	"quantuccia",
	NULL,
	-1,
	QuantucciaMethods,
	NULL,
	NULL,
	NULL,
	NULL
};

PyMODINIT_FUNC PyInit_quantuccia(void){
    PyObject *m;
    m = PyModule_Create(&quantuccia_module_def);
    return m;
}

#include <Python.h>
#include "Quantuccia/ql/time/calendars/unitedstates.hpp"

static PyObject*
get_holiday_date(PyObject *self, PyObject *args)
{
    return NULL;
}
 
static PyMethodDef QuantucciaMethods[] = {
	{"get_holiday_date", (PyCFunction)get_holiday_date, METH_VARARGS, NULL},
	{NULL, NULL, 0, NULL}
};

static struct PyModuleDef quantuccia_module_def = {
	PyModuleDef_HEAD_INIT,
	"quantuccia",
	NULL,
	-1,
	QuantucciaMethods,
	NULL,
	NULL,
	NULL,
	NULL
};

PyMODINIT_FUNC PyInit_quantuccia(void){
    PyObject *m;
    m = PyModule_Create(&quantuccia_module_def);
    return m;
}

--- 
+++ 
@@ -4,7 +4,7 @@
 static PyObject*
 get_holiday_date(PyObject *self, PyObject *args)
 {
-    return NULL;
+    return Py_None;
 }
  
 static PyMethodDef QuantucciaMethods[] = {
Change return NULL -> return Py_None.
