code: def input_on_stderr(prompt='', default=None, convert=None):
      
  
      print(prompt, end='', file=sys.stderr)
      value = builtins.input()
      return _convert(value, default, convert)
docs: Output a string to stderr and wait for input.
  
      Args:
          prompt (str): the message to display.
          default: the default value to return if the user
              leaves the field empty
          convert (callable): a callable to be used to convert
              the value the user inserted. If None, the type of
              ``default`` will be used.