new_contents: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  # PyAX-12
  
  # The MIT License
  #
  # Copyright (c) 2010,2015 Jeremie DECOCK (http://www.jdhp.org)
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  
  """
  A PyAX-12 demo.
  
  Returns the ID list of available Dynamixel units.
  """
  
  import pyax12.packet as pk
  
  from pyax12.connection import Connection
  from pyax12.argparse_default import common_argument_parser
  
  import time
  
  def main():
      """
      A PyAX-12 demo.
  
      Returns the ID list of available Dynamixel units.
      """
  
      # Parse options
      parser = common_argument_parser(desc=main.__doc__, id_arg=False)
      args = parser.parse_args()
  
      # Connect to the serial port
      serial_connection = Connection(args.port, args.baudrate, args.timeout)
  
      # Ping the dynamixel unit(s)
      ids_available = serial_connection.scan()
  
      for dynamixel_id in ids_available:
          print(dynamixel_id)
  
      # Close the serial connection
      serial_connection.close()
  
  
  if __name__ == '__main__':
      main()
  
subject: Add a demo.