diff --git a/.gitignore b/.gitignore
index 921eb25..8b36dd4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,5 @@
 local
 .loxi_ts.*
 .loxi_gen_files
+loxi_output
+loxigen.log
diff --git a/lang_python.py b/lang_python.py
index 7c4a0e3..4d64e8d 100644
--- a/lang_python.py
+++ b/lang_python.py
@@ -63,6 +63,9 @@
 
 versions = {
     1: "of10",
+    2: "of11",
+    3: "of12",
+    4: "of13"
 }
 
 prefix = 'pyloxi/loxi'
diff --git a/py_gen/templates/const.py b/py_gen/templates/const.py
index c5a0e93..93418a1 100644
--- a/py_gen/templates/const.py
+++ b/py_gen/templates/const.py
@@ -37,7 +37,7 @@
 OFP_VERSION = ${version}
 
 :: for (group, idents) in sorted(groups.items()):
-::    idents.sort(key=lambda (ident, value): eval(value))
+::    idents.sort(key=lambda (ident, value): eval(value) if value != 'OFPVID_NONE' else 0)
 # Identifiers from group ${group}
 ::    for (ident, value) in idents:
 ::        if version == 1 and ident.startswith('OFPP_'):
diff --git a/py_gen/templates/toplevel_init.py b/py_gen/templates/toplevel_init.py
index c990aa3..3151404 100644
--- a/py_gen/templates/toplevel_init.py
+++ b/py_gen/templates/toplevel_init.py
@@ -36,6 +36,15 @@
     if ver == 1:
         import of10
         return of10
+    elif ver == 2:
+        import of11
+        return of11
+    elif ver == 3:
+        import of12
+        return of12
+    elif ver == 4:
+        import of13
+        return of13
     else:
         raise ValueError