[protobuf] protobuf python error “cannot assign to extension because it is a repeated or composite type”

[Yuqi Chou]

when build the proto object, "TypeError: Cannot assign to extension 
"actionRequest" because it is a repeated or composite type."

proto file:

message Message{
    message MessageContent{
        extensions 100 to max;
    }
     optional MessageContent content = 1;}
message ActionRequest{
    optional string token = 1;

}

extend Message.MessageContent {
   optional ActionRequest actionRequest = 200;}

code:

import TestPb_pb2
message = TestPb_pb2.Message()
request = TestPb_pb2.ActionRequest()
message.content.Extensions[TestPb_pb2.actionRequest] = request

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