def _resolve_key(cls, key: str) -> str:
        """
        Map from a config key to the config object attribute, which must not but a
        python keyword.
        """
        if iskeyword(key):
            return f"{key}_"
        return key

        Map from a config key to the config object attribute, which must not but a
        python keyword.
        
poethepoet/options/__init__.py