#NEWLINE# def get_all_dbinstance_ids( self , region_id = None ) : #NEWLINE# #INDENT# 'Get all the instance ids in a region.\n\n        Args:\n            zone_id (str, optional): The Zone ID to get instance ids from.\n\n        Returns:\n            The list of instance ids.\n        ' #NEWLINE# return [ x . instance_id for x in self . describe_all_db_instances ( region_id ) ]