new_contents: ####
  # This script demonstrates how to use the metadata API to query information on a published data source
  #
  # To run the script, you must have installed Python 3.5 or later.
  ####
  
  import argparse
  import logging
  from pprint import pprint
  
  import tableauserverclient as TSC
  
  
  def main():
      parser = argparse.ArgumentParser(description='Use the metadata API to get information on a published data source.')
      # Common options; please keep those in sync across all samples
      parser.add_argument('--server', '-s', required=True, help='server address')
      parser.add_argument('--site', '-S', help='site name')
      parser.add_argument('--token-name', '-n', required=True,
                          help='name of the personal access token used to sign into the server')
      parser.add_argument('--token-value', '-v', required=True,
                          help='value of the personal access token used to sign into the server')
      parser.add_argument('--logging-level', '-l', choices=['debug', 'info', 'error'], default='error',
                          help='desired logging level (set to error by default)')
      # Options specific to this sample
      parser.add_argument('datasource_name', nargs='?', help="The name of the published datasource. If not present, we query all data sources.")
  
  
      args = parser.parse_args()
  
      # Set logging level based on user input, or error by default
      logging_level = getattr(logging, args.logging_level.upper())
      logging.basicConfig(level=logging_level)
  
      # Sign in to server
      tableau_auth = TSC.PersonalAccessTokenAuth(args.token_name, args.token_value, site_id=args.site)
      server = TSC.Server(args.server, use_server_version=True)
      with server.auth.sign_in(tableau_auth):
          # Execute the query
          result = server.metadata.query("""
              query useMetadataApiToQueryOrdersDatabases($name: String){
                  publishedDatasources (filter: {name: $name}) {
                      luid
                      name
                      description
                      projectName
                      fields {
                          name
                      }
                  }
              }""", {"name": args.datasource_name})
  
          # Display warnings/errors (if any)
          if result.get("errors"):
              print("### Errors/Warnings:")
              pprint(result["errors"])
          
          # Print the results
          if result.get("data"):
              print("### Results:")
              pprint(result["data"]["publishedDatasources"])
  
  if __name__ == '__main__':
      main()
  
subject: Add example for querying metadata API (#895)