Using YDK - Unable to get output from cisco NCS5500 router

Using YDK  , unable to get operational data from Cisco NCS 5500 router .

 Error output

---------------

  File "test7.py", line 29, in <module>

    print("cpu util" is " +str(Cpu_util.total_cpu_one_minute))

AttributeError: 'YList' object has no attribute 'total_cpu_one_minute'

 cpu util Script

--------------------

from ydk.services import CRUDService,CodecService

from ydk.providers import NetconfServiceProvider,CodecServiceProvider

from ydk.models.cisco_ios_xr import Cisco_IOS_XR_shellutil_oper \

as xr_shellutil_oper

from ydk.models.cisco_ios_xr import Cisco_IOS_XR_wdsysmon_fd_oper \

as xr_wd_oper

from datetime import timedelta

if __name__ == "__main__":

    """Main execution path"""

# create NETCONF session

provider = NetconfServiceProvider(address="192.168.30.167",

                                  username="fabtool",

                                  password="NatRas@321",

                                  protocol="ssh") 

# create CRUD service

crud = CRUDService()

# create system time object

system_time = xr_wd_oper.SystemMonitoring.CpuUtilization()

print system_time.total_cpu_one_minute 

Cpu_util= crud.read(provider, system_time,only_config=False) 

print("Cpu util is " +str(Cpu_util.total_cpu_one_minute)) 

Kindly do the needful for resolution.

When you query the system monitoring subtree, the result you get back is not a simple scalar value. If you look at the YANG tree for the schema: 

module: Cisco-IOS-XR-wdsysmon-fd-oper

    +--ro system-monitoring

       +--ro cpu-utilization*

          +--ro node-name                   xr:Node-id

          +--ro total-cpu-one-minute?       uint32

          +--ro total-cpu-five-minute?      uint32

          +--ro total-cpu-fifteen-minute?   uint32

          +--ro process-cpu*

             +--ro process-name?                 string

             +--ro process-id?                   uint32

             +--ro process-cpu-one-minute?       uint32

             +--ro process-cpu-five-minute?      uint32

             +--ro process-cpu-fifteen-minute?   uint32 

This means that your print statement: 

print("Cpu util is " +str(Cpu_util.total_cpu_one_minute))

 …is just wrong. The error message ("AttributeError: 'YList' object has no attribute ‘total_cpu_one_minute’”) is also pointing this out to you. The CPU utilization is a list entries, keyed by the node_name. Please try iterating over the return data. For example:

 for c in Cpu_util:

    print(‘Node %s one-minute CPU utilization is %d’ % (c.node_name, c.total_cpu_one_minute))

you also want to look at the documentation for the model.  In particular, you'll see that 'cpu_utilization' is a list and 'node_name' acts as key:

https://goo.gl/LJMZGQ