translate the following code from ruby to python：
@TESTER.start_traffic
wait 4
@TESTER.stop_traffic 
SYS.wait_operate(30,0){
                  rs = @RTA.mntDev.check_cpu_usage(:slot => @port1_rta_toTester.bid)
                  }
expect("1、两个用户使用arp探测成功，用户保持在线；") {
rs = @RTA.aaa.get_access_user_detail(:userName=>@nodomain)}