The sizes argument of setinputsizes() is not optional, according to PEP 249

Author: Erlend E. Aasland

Modules/_sqlite/clinic/cursor.c.h

@@ -196,36 +196,13 @@ pysqlite_cursor_fetchall(pysqlite_Cursor *self, PyObject *Py_UNUSED(ignored))
 }
 
 PyDoc_STRVAR(pysqlite_cursor_setinputsizes__doc__,
-"setinputsizes($self, sizes=None, /)\n"
+"setinputsizes($self, sizes, /)\n"
 "--\n"
 "\n"
 "Required by DB-API. Does nothing in pysqlite.");
 
 #define PYSQLITE_CURSOR_SETINPUTSIZES_METHODDEF    \
-    {"setinputsizes", (PyCFunction)(void(*)(void))pysqlite_cursor_setinputsizes, METH_FASTCALL, pysqlite_cursor_setinputsizes__doc__},
-
-static PyObject *
-pysqlite_cursor_setinputsizes_impl(pysqlite_Cursor *self, PyObject *sizes);
-
-static PyObject *
-pysqlite_cursor_setinputsizes(pysqlite_Cursor *self, PyObject *const *args, Py_ssize_t nargs)
-{
-    PyObject *return_value = NULL;
-    PyObject *sizes = Py_None;
-
-    if (!_PyArg_CheckPositional("setinputsizes", nargs, 0, 1)) {
-        goto exit;
-    }
-    if (nargs < 1) {
-        goto skip_optional;
-    }
-    sizes = args[0];
-skip_optional:
-    return_value = pysqlite_cursor_setinputsizes_impl(self, sizes);
-
-exit:
-    return return_value;
-}
+    {"setinputsizes", (PyCFunction)pysqlite_cursor_setinputsizes, METH_O, pysqlite_cursor_setinputsizes__doc__},
 
 PyDoc_STRVAR(pysqlite_cursor_setoutputsize__doc__,
 "setoutputsize($self, size, column=None, /)\n"
@@ -279,4 +256,4 @@ pysqlite_cursor_close(pysqlite_Cursor *self, PyObject *Py_UNUSED(ignored))
 {
     return pysqlite_cursor_close_impl(self);
 }
-/*[clinic end generated code: output=99f4f8ae754cf21c input=a9049054013a1b77]*/
+/*[clinic end generated code: output=76e0ac8ad72a5d6c input=a9049054013a1b77]*/

Modules/_sqlite/cursor.c

@@ -891,15 +891,15 @@ pysqlite_cursor_fetchall_impl(pysqlite_Cursor *self)
 /*[clinic input]
 _sqlite3.Cursor.setinputsizes as pysqlite_cursor_setinputsizes
 
-    sizes: object = None
+    sizes: object
     /
 
 Required by DB-API. Does nothing in pysqlite.
 [clinic start generated code]*/
 
 static PyObject *
-pysqlite_cursor_setinputsizes_impl(pysqlite_Cursor *self, PyObject *sizes)
-/*[clinic end generated code: output=a06c12790bd05f2e input=d058d07e828431de]*/
+pysqlite_cursor_setinputsizes(pysqlite_Cursor *self, PyObject *sizes)
+/*[clinic end generated code: output=893c817afe9d08ad input=7cffbb168663bc69]*/
 {
     Py_RETURN_NONE;
 }