class_docstr: ::
  
      with raw_mode(stdin):
          ''' the pseudo-terminal stdin is now used in raw mode '''
  
  We ignore errors when executing `tcgetattr` fails.
code: def _patch_lflag(cls, attrs):
      return attrs & ~(
          termios.ECHO | termios.ICANON | termios.IEXTEN | termios.ISIG
      )
  
imports: from __future__ import unicode_literals
  import os
  import re
  import six
  import termios
  import tty
  from six.moves import range
  from ..keys import Keys
  from ..key_binding.input_processor import KeyPress
label_desc: Use image node_id 3 for calling the raw_mode obj's underlying member method code with example usage: obj._patch_lflag(cls, attrs) and returns: unknown