code: def start(self, start_loop=True):
          
          self.start_alerts()
          if self.options.get('pidfile'):
              with open(self.options.get('pidfile'), 'w') as fpid:
                  fpid.write(str(os.getpid()))
          self.callback.start()
          LOGGER.info('Reactor starts')
  
          if start_loop:
              self.loop.start()
docs: Start all the things.
  
          :param start_loop bool: whether to start the ioloop. should be False if
                                  the IOLoop is managed externally