Method setdefault

sphinx/environment/__init__.py:1177–1178

(self, key: str, default: Any | None = None)

        return self._extension_data.pop(key, default)

    def setdefault(self, key: str, default: Any | None = None) -> Any | None:
        return self._extension_data.setdefault(key, default)

    def clear(self) -> None:
        _CurrentDocument.__init__(self)  # NoQA: PLC2801