Method setdefault

starlette/datastructures.py:348–353

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

        self._list.clear()

    def setdefault(self, key: Any, default: Any = None) -> Any:
        if key not in self:
            self._dict[key] = default
            self._list.append((key, default))

        return self[key]

    def setlist(self, key: Any, values: list[Any]) -> None:
        if not values: