class spawn(SpawnBase):
  '''This is the main class interface for Pexpect. Use this class to start
  and control child applications. '''
  # This is purely informational now - changing it has no effect
  use_native_pty_fork = use_native_pty_fork
def __init__(self, command, args=[], timeout=30, maxread=2000,
           searchwindowsize=None, logfile=None, cwd=None, env=None,
           ignore_sighup=False, echo=True, preexec_fn=None,
           encoding=None, codec_errors='strict', dimensions=None,
           use_poll=False):