def get_input_var_names(self):
        """Return a list of variables names that can be set as input.

        Returns
        -------
        var_names : list[str]
            A list of variable names that can be set from the outside
        """
        in_vars = copy.copy(self.input_vars)
        for idx, var in enumerate(in_vars):
            if self._map_in_out(var) is not None:
                in_vars[idx] = self._map_in_out(var)
        return in_vars
Return a list of variables names that can be set as input.

        Returns
        -------
        var_names : list[str]
            A list of variable names that can be set from the outside