class_docstr: Col-based storage.
class_docstr_tok: ["Col-based","storage","."]
code: def size(self) -> int:
      return self._size
  
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 11 for calling the DataQueue obj's underlying member method code with example usage: obj.size() and returns: self