new_contents: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  import argparse
  import json
  
  """
  ansible -i dynamic_inventory all --list-host
  ansible -i dynamic_inventory test --list-host
  """
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      group = parser.add_mutually_exclusive_group()
      group.add_argument('--host', help = "called by ansible")
      group.add_argument('--list', action = 'store_true', default = False,
              help = "called by ansible")
      arg = parser.parse_args()
  
      json_str = """{
      "all" : {
          "hosts" : [ "june", "july" ],
          "vars" : { "a" : "123" },
          "children" : [ "test" ]
      },
      "test" : {
          "hosts" : [ "host1", "host2" ],
          "vars" : { "b" : "123" }
      },
      "_meta": {
          "hostvars": {
              "july": {"ansible_ssh_user" : "yuncliu",  "ansible_ssh_pass" : "yuncliu"},
              "june": {"ansible_ssh_user" : "yuncliu",  "ansible_ssh_pass" : "yuncliu"}
          }
      }
      }"""
      json_obj = json.loads(json_str);
  
      if arg.host:
          try:
              print(json.dumps(json_obj['meta']['hostvars'][arg.host]))
          except:
              print(json.dumps({}))
  
      if arg.list:
          print(json.dumps(json_obj))
  
subject: add a ansible dynamic inventory example