class_docstr: Col-based storage.
class_docstr_tok: ["Col-based","storage","."]
code: def sealed(self) -> bool:
      return self._sealed
  
imports: import threading
  import copy
  from enum import Enum, auto
  from typing import List, Tuple, Union, Dict, Optional
  from collections import deque, namedtuple
label_desc: Use image node_id 15 for calling the DataQueue obj's underlying member method code with example usage: obj.sealed() and returns: self