code: def _process_arguments(self, arguments):
          
          if not arguments:
              return None
          a = arguments.split(" :", 1)
          arglist = a[0].split()
          if len(a) == 2:
              arglist.append(a[1])
          return arglist
docs: Process the arguments
  
          :param arguments: arguments string of a message
          :type arguments: :class:`str` | None
          :returns: A list of arguments
          :rtype: :class:`list` of :class:`str` | None
          :raises: None