class_docstr: List column, for debug.
class_docstr_tok: ["List","column",",","for","debug","."]
code: def size(self):
      return len(self._q) - self._index
  
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 4 for calling the _ListColumn obj's underlying member method code with example usage: obj.size() and returns: unknown