add list vmc task sample

Signed-off-by: Tianhao He <het@vmware.com>

samples/vmc/networks_nsxt/hello_world.py

@@ -64,5 +64,6 @@ def main():
     auth_example = AuthExample()
     auth_example.get_domains()
 
+
 if __name__ == '__main__':
     main()

samples/vmc/tasks/list_tasks.py

@@ -0,0 +1,67 @@
+"""
+* *******************************************************
+* Copyright (c) VMware, Inc. 2019. All Rights Reserved.
+* SPDX-License-Identifier: MIT
+* *******************************************************
+*
+* DISCLAIMER. THIS PROGRAM IS PROVIDED TO YOU "AS IS" WITHOUT
+* WARRANTIES OR CONDITIONS OF ANY KIND, WHETHER ORAL OR WRITTEN,
+* EXPRESS OR IMPLIED. THE AUTHOR SPECIFICALLY DISCLAIMS ANY IMPLIED
+* WARRANTIES OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY,
+* NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.
+"""
+
+__author__ = 'VMware, Inc.'
+
+import argparse
+
+from com.vmware.vmc.model_client import Task
+from vmware.vapi.vmc.client import create_vmc_client
+
+"""
+Demonstrates how to list tasks with given status
+
+Sample Prerequisites:
+    - VMware Cloud on AWS console API access
+"""
+
+accepted = [Task.STATUS_STARTED, Task.STATUS_CANCELING, Task.STATUS_FINISHED,
+            Task.STATUS_FAILED, Task.STATUS_CANCELED]
+
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+
+parser.add_argument('--refresh-token',
+                    required=True,
+                    help='VMware Cloud API refresh token')
+
+parser.add_argument('--org-id',
+                    required=True,
+                    help='Organization identifier.')
+
+parser.add_argument('--task-status',
+                    help='Task status to filter. Possible values are: {} \
+                    Show all tasks if no value is passed'.format(accepted))
+
+args = parser.parse_args()
+
+vmc_client = create_vmc_client(args.refresh_token)
+
+tasks = []
+
+if args.task_status:
+    status = args.task_status.upper()
+
+    if status not in accepted:
+        raise ValueError('Status "{}" is invalid, accept values are {}'.
+                        format(args.task_status, accepted))
+
+    tasks = vmc_client.orgs.Tasks.list(
+        org=args.org_id, filter="(status eq '{}')".format(status))
+
+    print('# List all "{}" tasks:\n'.format(status))
+else:
+    tasks = vmc_client.orgs.Tasks.list(org=args.org_id)
+    print('# List all tasks:\n')
+
+for task in tasks:
+    print('{}\n'.format(task))