code: def get(self, key):
          
          check_not_none(key, "key can't be none")
          return self._encode_invoke(transactional_multi_map_get_codec, key=self._to_data(key))
docs: Transactional implementation of :func:`MultiMap.get(key) <hazelcast.proxy.multi_map.MultiMap.get>`
  
          :param key: (object), the key whose associated values are returned.
          :return: (Sequence), the collection of the values associated with the key.