In the trunk enum_type_wrappers.py is not installed with 'python setup.py install' due to a missing entry in the python/setup.py file.This should fix it:Index: python/setup.py===================================================================--- python/setup.py (revision 456)+++ python/setup.py (working copy)@@ -167,6 +167,7 @@'google.protobuf.internal.cpp_message','google.protobuf.internal.decoder','google.protobuf.internal.encoder',+ 'google.protobuf.internal.enum_type_wrapper','google.protobuf.internal.message_listener','google.protobuf.internal.python_message','google.protobuf.internal.type_checkers',Regardsthi