diff --git a/tools/pylibopenflow/pylib/of/pythonize.py b/tools/pylibopenflow/pylib/of/pythonize.py
new file mode 100644
index 0000000..687512b
--- /dev/null
+++ b/tools/pylibopenflow/pylib/of/pythonize.py
@@ -0,0 +1,57 @@
+"""This module generate Python code for OpenFlow structs.
+
+(C) Copyright Stanford University
+Date December 2009
+Created by ykk
+"""
+import cpythonize
+from config import *
+
+class rules(cpythonize.rules):
+    """Class that specify rules for pythonization of OpenFlow messages
+
+    (C) Copyright Stanford University
+    Date December 2009
+    Created by ykk
+    """
+    def __init__(self, ofmsg):
+        """Initialize rules
+        """
+        cpythonize.rules.__init__(self)
+        ##Reference to ofmsg
+        self.__ofmsg = ofmsg
+        ##Default values for members
+        self.default_values[('ofp_header','version')] = self.__ofmsg.get_value('OFP_VERSION')
+        self.default_values[('ofp_switch_config',\
+                             'miss_send_len')] = self.__ofmsg.get_value('OFP_DEFAULT_MISS_SEND_LEN')
+        for x in ['ofp_flow_mod','ofp_flow_expired','ofp_flow_stats']:
+            self.default_values[(x,'priority')] = self.__ofmsg.get_value('OFP_DEFAULT_PRIORITY')
+        #Default values for struct
+        self.struct_default[('ofp_flow_mod',
+                             'header')] = ".type = OFPT_FLOW_MOD"
+#                             'header')] = ".type = "+str(self.__ofmsg.get_value('OFPT_FLOW_MOD'))
+        ##Macros to exclude
+        self.excluded_macros = ['OFP_ASSERT(EXPR)','OFP_ASSERT(_EXPR)','OFP_ASSERT',
+                                'icmp_type','icmp_code','OFP_PACKED',
+                                'OPENFLOW_OPENFLOW_H']
+        ##Enforce mapping
+        if GEN_ENUM_VALUES_LIST:
+            self.enforced_maps['ofp_header'] = [ ('type','ofp_type_values') ]
+        elif GEN_ENUM_DICTIONARY:
+            self.enforced_maps['ofp_header'] = \
+                [ ('type','ofp_type_map.values()') ]
+        
+class pythonizer(cpythonize.pythonizer):
+    """Class that pythonize C structures of OpenFlow messages
+
+    (C) Copyright Stanford University
+    Date December 2009
+    Created by ykk
+    """
+    def __init__(self, ofmsg):
+        """Initialize
+        """
+        ofrules =  rules(ofmsg)
+        cpythonize.pythonizer.__init__(self, ofmsg, ofrules)
+        ##Reference to OpenFlow message class
+        self.__ofmsg = ofmsg