code: def load_extra(cls, filename):
      
      try:
        with open(filename, 'rb') as configuration_file:
          cls.load_extra_data(configuration_file.read())
          sys.stderr.write("Config successfully loaded from {0:s}\n".format(
              filename))
          return True
      except IOError:
        return False
docs: Loads extra JSON configuration parameters from a file on the filesystem.
  
      Args:
        filename: str, the filename to open.
  
      Returns:
        bool: True if the extra configuration parameters were read.