code: def put(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_multi_map_put_codec, key=self._to_data(key),
                                     value=self._to_data(value))
docs: Transactional implementation of :func:`MultiMap.put(key, value) <hazelcast.proxy.multi_map.MultiMap.put>`
  
          :param key: (object), the key to be stored.
          :param value: (object), the value to be stored.
          :return: (bool), ``true`` if the size of the multimap is increased, ``false`` if the multimap already contains the
          key-value tuple.