Class DataNode

dask/_task_spec.py:566–608

class DataNode(GraphNode):
    value: Any
    typ: type
    __slots__ = tuple(__annotations__)

    def __init__(self, key: Any, value: Any):
        if key is None:
            key = (type(value).__name__, next(_anom_count))
        self.key = key
        self.value = value
        self.typ = type(value)
        self._dependencies = _no_deps

    @property
    def data_producer(self) -> bool:
        return True

    def copy(self):
        return DataNode(self.key, self.value)

    def __call__(self, values=()):
        return self.value

    def __repr__(self):
        return f"DataNode({self.value!r})"

    def __reduce__(self):
        return (DataNode, (self.key, self.value))

    def __dask_tokenize__(self):
        from dask.base import tokenize

        return (type(self).__name__, tokenize(self.value))

    def substitute(
        self, subs: dict[KeyType, KeyType | GraphNode], key: KeyType | None = None
    ) -> DataNode:
        if key is not None and key != self.key:
            return DataNode(key, self.value)
        return self

    def __iter__(self):
        return iter(self.value)


def _get_dependencies(obj: object) -> set | frozenset: