def _step_decorator_args(self, decorator):
        """
        Get arguments passed to step decorators converted to python objects.
        """
        args = decorator.call.value
        step = None
        if len(args) == 1:
            try:
                step = args[0].value.to_python()
            except (ValueError, SyntaxError):
                pass
            if isinstance(step, six.string_types + (list,)):
                return step
            logging.error("Decorator step accepts either a string or a list of \
                strings - %s",
                          self.file_path)
        else:
            logging.error("Decorator step accepts only one argument - %s",
                          self.file_path)
Get arguments passed to step decorators converted to python objects.