class_docstr: Abstraction for any input.
  
  An instance of this class can be given to the constructor of a
  :class:`~prompt_toolkit.application.Application` and will also be
  passed to the :class:`~prompt_toolkit.eventloop.base.EventLoop`.
docstr: The event loop can call this when the input has to be flushed.
docstr_tok: ["The","event","loop","can","call","this","when","the","input","has","to","be","flushed","."]
code: def flush(self) -> None:
      "The event loop can call this when the input has to be flushed."
      pass
  
imports: from __future__ import annotations
  from abc import ABCMeta, abstractmethod, abstractproperty
  from contextlib import contextmanager
  from typing import Callable, ContextManager, Generator
  from prompt_toolkit.key_binding import KeyPress
label_desc: Use image node_id 5 for calling the Input obj's underlying member method code with example usage: obj.flush() without return types