Workaround lack of _Py_ID in CPython 3.10.x

Author: hartwork

Modules/pyexpat.c

@@ -109,9 +109,11 @@ static struct HandlerInfo handler_info[64];
 static int
 set_xml_error_attr_code(PyObject *err, enum XML_Error code)
 {
+    PyObject *py_id_code = PyUnicode_InternFromString("code");
     PyObject *v = PyLong_FromLong((long)code);
-    int ok = v != NULL && PyObject_SetAttr(err, &_Py_ID(code), v) != -1;
+    int ok = v != NULL && PyObject_SetAttr(err, py_id_code, v) != -1;
     Py_XDECREF(v);
+    Py_XDECREF(py_id_code);
     return ok;
 }