def update_args(self, args):
        """Update config dictionary with parsed args, as resolved by argparse.
        Only root positional arguments that already exist will overridden.

        Args:
            args (namespace): args parsed by argparse

        """

        for arg in vars(args):
            if self.get(arg) and getattr(args, arg) is not None:
                self._config[self.root_section][arg] = getattr(args, arg)
Update config dictionary with parsed args, as resolved by argparse.
        Only root positional arguments that already exist will overridden.

        Args:
            args (namespace): args parsed by argparse