Here is a bytes type.  It's very minimal but it's a start.
diff --git a/Objects/object.c b/Objects/object.c
index a75c14e..9a451d2 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -1881,6 +1881,9 @@
 	if (PyType_Ready(&PyBool_Type) < 0)
 		Py_FatalError("Can't initialize 'bool'");
 
+	if (PyType_Ready(&PyBytes_Type) < 0)
+		Py_FatalError("Can't initialize 'bytes'");
+
 	if (PyType_Ready(&PyString_Type) < 0)
 		Py_FatalError("Can't initialize 'str'");