def put(self, key, value):
check_not_none(key, "<STR_LIT>")<EOL>check_not_none(value, "<STR_LIT>")<EOL>return self._encode_invoke(transactional_multi_map_put_codec, key=self._to_data(key),<EOL>value=self._to_data(value))<EOL>
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.