new_contents: #!/usr/bin/env python
  
  # This work was created by participants in the DataONE project, and is
  # jointly copyrighted by participating institutions in DataONE. For
  # more information on DataONE, see our web site at http://dataone.org.
  #
  #   Copyright 2009-2019 DataONE
  #
  # 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.
  """Download Science Objects from a Member Node or Coordinating Node.
  
  This is an example on how to use the DataONE Client and Common libraries for Python. It
  shows how to:
  
  - Download a Science Object from a MN or CN.
  """
  
  import logging
  import sys
  
  import d1_common.utils.filesystem
  
  import d1_client.cnclient_2_0
  import d1_client.command_line
  
  log = logging.getLogger(__name__)
  
  
  def main():
      parser = d1_client.command_line.get_standard_arg_parser(__doc__)
      parser.add_argument("pid", help="PID of object to download")
      parser.add_argument(
          "path",
          type=str,
          nargs="?",
          help=(
              "Optional save path for downloaded object. "
              "If not specified, saved in current directory "
              "with name derived from the PID"
          ),
      )
      args = parser.parse_args()
      d1_client.command_line.log_setup(args)
  
      client = d1_client.cnclient_2_0.CoordinatingNodeClient_2_0(
          **d1_client.command_line.args_adapter(args)
      )
  
      path = args.path or d1_common.utils.filesystem.gen_safe_path_element(args.pid)
      try:
          with open(path, "wb") as f:
              client.get_and_save(args.pid, f)
      except Exception as e:
          log.error("Download failed: {}".format(str(e)))
          return 1
  
      log.info("Downloaded successfully to: {}".format(path))
      return 0
  
  
  if __name__ == "__main__":
      sys.exit(main())
  
subject: Add utility/example for downloading single sciobj from CN or MN