$ ./gn-read-xr-shellutil-oper-20-ydk.py ssh://admin:admin@198.18.1.11:57400 -v
2019-01-14 19:02:40,437 - ydk - INFO - gNMIServiceProvider Connected to 198.18.1.11 via Insecure Channel
2019-01-14 19:02:40,439 - ydk - INFO - Executing CRUD read operation on [Cisco-IOS-XR-shellutil-oper:system-time]
2019-01-14 19:02:40,440 - ydk - INFO - 
=============== Get Request Sent ================
path {
  origin: "Cisco-IOS-XR-shellutil-oper"
  elem {
    name: "system-time"
  }
}
encoding: JSON_IETF


2019-01-14 19:02:40,507 - ydk - INFO - 
============= Get Response Received =============
notification {
  timestamp: 1547470569905132305
  update {
    path {
      origin: "Cisco-IOS-XR-shellutil-oper"
      elem {
        name: "system-time"
      }
    }
    val {
      json_ietf_val: "{\"clock\":{\"year\":2019,\"month\":1,\"day\":14,\"hour\":12,\"minute\":56,\"second\":9,\"millisecond\":874,\"wday\":1,\"time-zone\":\"UTC\",\"time-source\":\"calendar\"},\"uptime\":{\"host-name\":\"r1\",\"uptime\":24349}}"
    }
  }
}
error {
}


2019-01-14 19:02:40,508 - ydk - INFO - Get Operation Succeeded
Segmentation fault (core dumped)
$ 

$ ls -a /home/admin/.ydk/198.18.1.11
.  ..  ietf-netconf@2011-06-01.yang  ydk@2016-02-26.yang
$ 

#!/usr/bin/env python
#
# Copyright 2016 Cisco Systems, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

"""
Read all data for model Cisco-IOS-XR-shellutil-oper.

usage: gn-read-xr-shellutil-oper-20-ydk.py [-h] [-v] device

positional arguments:
  device         gNMI device (ssh://user:password@host:port)

optional arguments:
  -h, --help     show this help message and exit
  -v, --verbose  print debugging messages
"""

from argparse import ArgumentParser
from urlparse import urlparse

from ydk.path import Repository
from ydk.services import CRUDService
from ydk.gnmi.providers import gNMIServiceProvider
from ydk.models.cisco_ios_xr import Cisco_IOS_XR_shellutil_oper \
    as xr_shellutil_oper
import datetime
import textwrap
import os
import logging


def process_system_time(system_time):
    """Process data in system_time object."""
    # format string for system time
    show_system_time = textwrap.dedent("""
        Host: {host}
        System time: {time} {tzone} {date}
        Time source: {source}
        System uptime: {uptime}
        """).strip()

    # create time object
    clock_time = datetime.time(system_time.clock.hour,
                               system_time.clock.minute,
                               system_time.clock.second,
                               system_time.clock.millisecond / 1000)

    # create date object
    clock_date = datetime.date(system_time.clock.year,
                               system_time.clock.month,
                               system_time.clock.day)

    # convert uptime from seconds
    clock_delta = datetime.timedelta(seconds=system_time.uptime.uptime)

    # return formatted string
    return(show_system_time.format(host=system_time.uptime.host_name,
                                   time=clock_time,
                                   tzone=system_time.clock.time_zone,
                                   date=clock_date,
                                   source=system_time.clock.time_source.name,
                                   uptime=clock_delta))


if __name__ == "__main__":
    """Execute main program."""
    parser = ArgumentPgNMI script results in a segmentation fault if repository is missing a required modelarser()
    parser.add_argument("-v", "--verbose", help="print debugging messages",
                        action="store_true")
    parser.add_argument("device",
                        help="gNMI device (ssh://user:password@host:port)")
    args = parser.parse_args()
    device = urlparse(args.device)

    # log debug messages if verbose argument specified
    if args.verbose:
        logger = logging.getLogger("ydk")
        logger.setLevel(logging.INFO)
        handler = logging.StreamHandler()
        formatter = logging.Formatter(("%(asctime)s - %(name)s - "
                                      "%(levelname)s - %(message)s"))
        handler.setFormatter(formatter)
        logger.addHandler(handler)

    # create gNMI session
    repository = Repository(os.path.expanduser("~/.ydk/"+device.hostname))
    provider = gNMIServiceProvider(repo=repository,
                                   address=device.hostname,
                                   port=device.port,
                                   username=device.username,
                                   password=device.password)

    # create CRUD service
    crud = CRUDService()

    system_time = xr_shellutil_oper.SystemTime()  # create object

    # read data from NETCONF device
    system_time = crud.read(provider, system_time)
    print(process_system_time(system_time))  # process object data

    exit()
# End of script