code: def dumps(obj, *transformers):
      
      marshaller = JavaObjectMarshaller()
      # Add custom transformers
      for transformer in transformers:
          marshaller.add_transformer(transformer)
  
      return marshaller.dump(obj)
docs: Serializes Java primitive data and objects unmarshaled by load(s) before
      into string.
  
      :param obj: A Python primitive object, or one loaded using load(s)
      :param transformers: Custom transformers to use
      :return: The serialized data as a string