Method __init__

starlette/datastructures.py:256–282

(
        self,
        *args: ImmutableMultiDict[_KeyType, _CovariantValueType]
        | Mapping[_KeyType, _CovariantValueType]
        | Iterable[tuple[_KeyType, _CovariantValueType]],
        **kwargs: Any,
    )

    _dict: dict[_KeyType, _CovariantValueType]

    def __init__(
        self,
        *args: ImmutableMultiDict[_KeyType, _CovariantValueType]
        | Mapping[_KeyType, _CovariantValueType]
        | Iterable[tuple[_KeyType, _CovariantValueType]],
        **kwargs: Any,
    ) -> None:
        assert len(args) < 2, "Too many arguments."

        value: Any = args[0] if args else []
        if kwargs:
            value = ImmutableMultiDict(value).multi_items() + ImmutableMultiDict(kwargs).multi_items()

        if not value:
            _items: list[tuple[Any, Any]] = []
        elif hasattr(value, "multi_items"):
            value = cast(ImmutableMultiDict[_KeyType, _CovariantValueType], value)
            _items = list(value.multi_items())
        elif hasattr(value, "items"):
            value = cast(Mapping[_KeyType, _CovariantValueType], value)
            _items = list(value.items())
        else:
            value = cast("list[tuple[Any, Any]]", value)
            _items = list(value)

        self._dict = {k: v for k, v in _items}
        self._list = _items

    def getlist(self, key: Any) -> list[_CovariantValueType]:
        return [item_value for item_key, item_value in self._list if item_key == key]