添加，减去 datetime.time 列熊猫

Question

我有以下数据框flight_departure   arrival_at_desination   boarding  total_flight_time   total_flight_time/2    time_to_collect_bags0:00                     4:00               23:30           4:00                  2:00                     4:309:00                     14:30              8:30            5:30                  2:45                      15:00flight_departure- 0:00 signifies 12:00 AMarrival_at_desination- 4:00 signifies 4 AMboarding = flight_departure-30 minutes(23:30)total_flight_time=arrival_at_desination-flight_departure(4 hours)total_flight_time/2-calculates hald time(2 hours in this case)time_to_collect_bags=arrival_at_desination+30 minutes(4:30AM)当我尝试执行以下操作时df['arrival_at_desination']-df['flight_departure']它给了我以下错误TypeError: unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'我应该如何减去两个 datetime.time 列？