diff --git a/Objects/stringobject.c b/Objects/stringobject.c
index 0e0af89..0aa1e5b3 100644
--- a/Objects/stringobject.c
+++ b/Objects/stringobject.c
@@ -1606,15 +1606,12 @@
 found, returns S and two empty strings.");
 
 static PyObject *
-string_partition(PyStringObject *self, PyObject *args)
+string_partition(PyStringObject *self, PyObject *sep_obj)
 {
 	Py_ssize_t len = PyString_GET_SIZE(self), sep_len, pos;
 	const char *str = PyString_AS_STRING(self), *sep;
-	PyObject *sep_obj;
 	PyObject * out;
 
-	if (!PyArg_ParseTuple(args, "O:partition", &sep_obj))
-		return NULL;
 	if (PyString_Check(sep_obj)) {
 		sep = PyString_AS_STRING(sep_obj);
 		sep_len = PyString_GET_SIZE(sep_obj);
@@ -3969,8 +3966,7 @@
 	{"count", (PyCFunction)string_count, METH_VARARGS, count__doc__},
 	{"endswith", (PyCFunction)string_endswith, METH_VARARGS,
 	 endswith__doc__},
-	{"partition", (PyCFunction)string_partition, METH_VARARGS,
-	 partition__doc__},
+	{"partition", (PyCFunction)string_partition, METH_O, partition__doc__},
 	{"find", (PyCFunction)string_find, METH_VARARGS, find__doc__},
 	{"index", (PyCFunction)string_index, METH_VARARGS, index__doc__},
 	{"lstrip", (PyCFunction)string_lstrip, METH_VARARGS, lstrip__doc__},
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 7702248..8291400 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6357,13 +6357,8 @@
 found, returns S and two empty strings.");
 
 static PyObject*
-unicode_partition(PyUnicodeObject *self, PyObject *args)
+unicode_partition(PyUnicodeObject *self, PyObject *separator)
 {
-    PyObject *separator;
-
-    if (!PyArg_ParseTuple(args, "O:partition", &separator))
-        return NULL;
-
     return PyUnicode_Partition((PyObject *)self, separator);
 }
 
@@ -6620,7 +6615,7 @@
     {"count", (PyCFunction) unicode_count, METH_VARARGS, count__doc__},
     {"expandtabs", (PyCFunction) unicode_expandtabs, METH_VARARGS, expandtabs__doc__},
     {"find", (PyCFunction) unicode_find, METH_VARARGS, find__doc__},
-    {"partition", (PyCFunction) unicode_partition, METH_VARARGS, partition__doc__},
+    {"partition", (PyCFunction) unicode_partition, METH_O, partition__doc__},
     {"index", (PyCFunction) unicode_index, METH_VARARGS, index__doc__},
     {"ljust", (PyCFunction) unicode_ljust, METH_VARARGS, ljust__doc__},
     {"lower", (PyCFunction) unicode_lower, METH_NOARGS, lower__doc__},