Method __init__

src/werkzeug/local.py:478–532

(
        self,
        local: ContextVar[T] | Local | LocalStack[T] | t.Callable[[], T],
        name: str | None = None,
        *,
        unbound_message: str | None = None,
    )

    """

    def __init__(
        self,
        local: ContextVar[T] | Local | LocalStack[T] | t.Callable[[], T],
        name: str | None = None,
        *,
        unbound_message: str | None = None,
    ) -> None:
        if name is None:
            get_name = _identity
        else:
            get_name = attrgetter(name)  # type: ignore[assignment]

        if unbound_message is None:
            unbound_message = "object is not bound"

        if isinstance(local, Local):
            if name is None:
                raise TypeError("'name' is required when proxying a 'Local' object.")

            def _get_current_object() -> T:
                try:
                    return get_name(local)  # type: ignore[return-value]
                except AttributeError:
                    raise RuntimeError(unbound_message) from None

        elif isinstance(local, LocalStack):

            def _get_current_object() -> T:
                obj = local.top

                if obj is None:
                    raise RuntimeError(unbound_message)

                return get_name(obj)

        elif isinstance(local, ContextVar):

            def _get_current_object() -> T:
                try:
                    obj = local.get()
                except LookupError:
                    raise RuntimeError(unbound_message) from None

                return get_name(obj)

        elif callable(local):

            def _get_current_object() -> T:
                return get_name(local())

        else:
            raise TypeError(f"Don't know how to proxy '{type(local)}'.")

        object.__setattr__(self, "_LocalProxy__wrapped", local)
        object.__setattr__(self, "_get_current_object", _get_current_object)

    __doc__ = _ProxyLookup(
        class_value=__doc__, fallback=lambda self: type(self).__doc__, is_attr=True