def popitemlist(self) -> tuple[K, list[V]]:
        """Pop a ``(key, list)`` tuple from the dict."""
        try:
            return super().popitem()  # type: ignore[return-value]
        except KeyError as e:
            raise exceptions.BadRequestKeyError(e.args[0]) from None
Pop a ``(key, list)`` tuple from the dict.
src/werkzeug/datastructures/structures.py