class_docstr: :class:`.History` class that keeps a list of all strings in memory.
  
  In order to prepopulate the history, it's possible to call either
  `append_string` for all items or pass a list of strings to `__init__` here.
code: def store_string(self, string: str) -> None:
      self._storage.append(string)
  
imports: from __future__ import annotations
  import datetime
  import os
  import threading
  from abc import ABCMeta, abstractmethod
  from asyncio import get_running_loop
  from typing import AsyncGenerator, Iterable, Sequence
label_desc: Use image node_id 3 for calling the InMemoryHistory obj's underlying member method code with example usage: obj.store_string(string) without return types