code: def format_ascii(sensor_graph):
      
  
      cmdfile = CommandFile("Sensor Graph", "1.0")
  
      # Clear any old sensor graph
      cmdfile.add("set_online", False)
      cmdfile.add("clear")
      cmdfile.add("reset")
  
      # Load in the nodes
      for node in sensor_graph.dump_nodes():
          cmdfile.add('add_node', node)
  
      # Load in the streamers
      for streamer in sensor_graph.streamers:
          other = 0xFF
          if streamer.with_other is not None:
              other = streamer.with_other
  
          args = [streamer.selector, streamer.dest, streamer.automatic, streamer.format, streamer.report_type, other]
          cmdfile.add('add_streamer', *args)
  
      # Load all the constants
      for stream, value in sorted(sensor_graph.constant_database.items(), key=lambda x: x[0].encode()):
          cmdfile.add("push_reading", stream, value)
  
      # Persist the sensor graph
      cmdfile.add("persist")
      cmdfile.add("set_online", True)
  
      return cmdfile.dump()
docs: Format this sensor graph as a loadable ascii file format.
  
      This includes commands to reset and clear previously stored
      sensor graphs.
  
      NB. This format does not include any required configuration
      variables that were specified in this sensor graph, so you
      should also output tha information separately in, e.g.
      the config format.
  
      Args:
          sensor_graph (SensorGraph): the sensor graph that we want to format
  
      Returns:
          str: The ascii output lines concatenated as a single string