class_docstr: A base class for a node in the graph of a workflow.
  
  A node may be an Operator or a Task Group, either mapped or unmapped.
docstr: Set a node (or nodes) to be directly upstream from the current node.
code: def set_upstream(
      self,
      task_or_task_list: DependencyMixin | Sequence[DependencyMixin],
      edge_modifier: EdgeModifier | None = None,
  ) -> None:
      """Set a node (or nodes) to be directly upstream from the current node."""
      self._set_relatives(
          task_or_task_list, upstream=True, edge_modifier=edge_modifier
      )
  
imports: from __future__ import annotations
  import warnings
  from abc import ABCMeta, abstractmethod
  from typing import TYPE_CHECKING, Any, Iterable, Sequence
  from airflow.exceptions import AirflowException, RemovedInAirflow3Warning
  from airflow.utils.types import NOTSET
label_desc: Use image node_id 10 for calling the DAGNode obj's underlying member method code with example usage: obj.set_upstream(task_or_task_list, edge_modifier) without return types