def _raw_columns(self) -> List[str]:
        """
        Get the list of raw data columns, excluding any dicts with callable values
        """
        return [
            list(col.values())[0] if isinstance(col, dict) else col
            for col in self._columns
            if not (
                isinstance(col, dict)
                and (
                    isinstance(list(col.values())[0], Callable)
                    or list(col.values())[0] is None
                )
            )
        ]

        Get the list of raw data columns, excluding any dicts with callable values
        
meteostat/interface/meteodata.py