for _id in sorted(world_db[category].keys()):
string = string + id_string + " " + str(_id) + "\n"
for key in sorted(world_db[category][_id].keys()):
for _id in sorted(world_db[category].keys()):
string = string + id_string + " " + str(_id) + "\n"
for key in sorted(world_db[category][_id].keys()):