class_docstr: Key used to identify task instance.
docstr: For API-compatibly with TaskInstance.
  
  Returns self
docstr_tok: ["For","API-compatibly","with","TaskInstance",".","Returns","self"]
code: def key(self) -> TaskInstanceKey:
      """For API-compatibly with TaskInstance.
  
      Returns self
      """
      return self
  
imports: from __future__ import annotations
  from typing import NamedTuple
label_desc: Use image node_id 4 for calling the TaskInstanceKey obj's underlying member method code with example usage: obj.key() and returns: self