code: def load_config(config_file):
      
      if not config_file or not os.path.isfile(config_file):
          raise ApplicationException(
              desc='Invalid configuration file: %s' % config_file)
  
      # Loads the configuration from the given file, if available.
      try:
          return load_source('bgpspeaker.application.settings', config_file)
      except Exception as e:
          raise ApplicationException(desc=str(e))
docs: Validates the given file for use as the settings file for BGPSpeaker
      and loads the configuration from the given file as a module instance.