I lost my pet snake

You didn't 'lose' it - you carelessly let it escape by not securing its vivarium ! It could be absolutely anywhere in your house - or - it's more likely found its way outdoors and is considerable distance away ! IF it's still in your house - you might get it back if it comes out of hiding. If it's outside - say goodbye to it forever, as it's very likely to have been eaten by another animal ! Use this 'episode' as a learning tool !