def update(self, data=values.unset, ttl=values.unset, item_ttl=values.unset,<EOL>collection_ttl=values.unset):
return self._proxy.update(data=data, ttl=ttl, item_ttl=item_ttl, collection_ttl=collection_ttl, )<EOL>
Update the SyncListItemInstance

:param dict data: Contains arbitrary user-defined, schema-less data that this List Item stores, represented by a JSON object, up to 16KB.
:param unicode ttl: Alias for item_ttl
:param unicode item_ttl: Time-to-live of this item in seconds, defaults to no expiration.
:param unicode collection_ttl: Time-to-live of this item's parent List in seconds, defaults to no expiration.

:returns: Updated SyncListItemInstance
:rtype: twilio.rest.sync.v1.service.sync_list.sync_list_item.SyncListItemInstance