old_contents: import threading
  
  # Thread running server processing loop
  class ServerThread(threading.Thread):
      def __init__(self, server):
          super(ServerThread, self).__init__()
          self.server = server
          self.running = True
  
      def run(self):
          while self.running:
              self.server.process(0.1)
      def stop(self):
          self.running = False
  
  
new_contents: import threading
  
  # Thread running server processing loop
  class ServerThread(threading.Thread):
      """
      A helper class to run server in a thread.
  
      The following snippet runs the server for 4 seconds and quit::
  
          server = SimpleServer()
          server_thread = ServerThread(server)
          server_thread.start()
          time.sleep(4)
          server_thread.stop()
  
      """
      def __init__(self, server):
          """
          :param server: :class:`pcaspy.SimpleServer` object
          """
          super(ServerThread, self).__init__()
          self.server = server
          self.running = True
  
      def run(self):
          """
          Start the server processing
          """
          while self.running:
              self.server.process(0.1)
  
      def stop(self):
          """
          Stop the server processing
          """
          self.running = False
  
  
subject: add docstring