class_docstr: The purpose of this helper symbol is to enable the injecting an asterisk
  into any formatted string no matter what format spec uses.
  
  For example:
  >>> '{a:.2f}-{b:.2f}'.format(a=3.5, b=Asterisk)
  >>> '3.50-*'
code: def __format__(self, __format_spec: str) -> str:
      return "*"
  
imports: import math
  import time
  import queue
  import threading
  from collections import defaultdict
  from dataclasses import dataclass, field
  from pathlib import Path
  from typing import ClassVar, Dict, Optional, Tuple, Set, Union, TYPE_CHECKING
  from cachetools import LRUCache
  from aim.sdk.reporter.file_manager import FileManager
  import logging
label_desc: Use image node_id 1 for calling the AsteriskType obj's underlying member method code with example usage: obj.__format__(__format_spec) and returns: str