disk_interface_type_choice = ( ('SATA', 'SATA'), ('SAS', 'SAS'), ('SCSI', 'SCSI'), ('SSD', 'SSD'), ('unknown', 'unknown'), ) 请问,这里面为什么不这样做？什么情况下会用0\1\2\3... disk_interface_type_choice = ( (0, 'SATA'), (1, 'SAS'), (2, 'SCSI'), (3, 'SSD'), (4, 'unknown'), )