def add(self, item):
check_not_none(item, "<STR_LIT>")<EOL>return self._encode_invoke(transactional_set_add_codec, item=self._to_data(item))<EOL>
Transactional implementation of :func:`Set.add(item) <hazelcast.proxy.set.Set.add>`

:param item: (object), the new item to be added.
:return: (bool), ``true`` if item is added successfully, ``false`` otherwise.