class_docstr: Empty data.
class_docstr_tok: ["Empty","data","."]
code: def __new__(cls, *args, **kw):
      if cls._instance is None:
          with cls._lock:
              cls._instance = object.__new__(cls, *args, **kw)
      return cls._instance
  
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 1 for calling the Empty obj's underlying member method code with example usage: obj.__new__(cls) and returns: cls