code: def put_if_absent(self, key, value):
          
          check_not_none(key, "key can't be none")
          check_not_none(value, "value can't be none")
          return self._encode_invoke(transactional_map_put_if_absent_codec, key=self._to_data(key),
                                     value=self._to_data(value))
docs: Transactional implementation of :func:`Map.put_if_absent(key, value)
          <hazelcast.proxy.map.Map.put_if_absent>`
  
          The object to be put will be accessible only in the current transaction context till the transaction is
          committed.
  
          :param key: (object), key of the entry.
          :param value: (object), value of the entry.
          :param ttl:  (int), maximum time in seconds for this entry to stay in the map (optional).
          :return: (object), old value of the entry.