class_docstr: A base class providing the backwards-compatible spawn API for Pexpect.
  
  This should not be instantiated directly: use :class:`pexpect.spawn` or
  :class:`pexpect.fdpexpect.fdspawn`.
docstr: This does nothing. It is here to support the interface for a
  File-like object. 
docstr_tok: ["This","does","nothing",".","It","is","here","to","support","the","interface","for","a","File-like","object","."]
code: def flush(self):
      """This does nothing. It is here to support the interface for a
      File-like object."""
      pass
  
imports: from io import StringIO, BytesIO
  import codecs
  import os
  import sys
  import re
  import errno
  from .exceptions import ExceptionPexpect, EOF, TIMEOUT
  from .expect import Expecter, searcher_string, searcher_re
label_desc: Use image node_id 20 for calling the SpawnBase obj's underlying member method code with example usage: obj.flush() without return types