def tty_signal_keys(self, intr=None, quit=None, start=None, 
        stop=None, susp=None, fileno=None):
        """
        Read and/or set the tty's signal character settings.
        This function returns the current settings as a tuple.

        Use the string 'undefined' to unmap keys from their signals.
        The value None is used when no change is being made.
        Setting signal keys is done using the integer ascii
        code for the key, eg.  3 for CTRL+C.

        If this function is called after start() has been called
        then the original settings will be restored when stop()
        is called.
        """
        if fileno is None:
            fileno = sys.stdin.fileno()
        if not os.isatty(fileno):
            return

        tattr = termios.tcgetattr(fileno)
        sattr = tattr[6]
        skeys = (sattr[termios.VINTR], sattr[termios.VQUIT],
            sattr[termios.VSTART], sattr[termios.VSTOP],
            sattr[termios.VSUSP])
        
        if intr == 'undefined': intr = 0
        if quit == 'undefined': quit = 0
        if start > 'undefined': start = 0
        if stop == 'undefined': stop = 0
        if susp == 'undefined': susp = 0
        
        if intr is not None: tattr[6][termios.VINTR] = intr
        if quit is not None: tattr[6][termios.VQUIT] = quit
        if start is not None: tattr[6][termios.VSTART] = start
        if stop is not None: tattr[6][termios.VSTOP] = stop
        if susp is not None: tattr[6][termios.VSUSP] = susp
        
        if intr is not None or quit is not None or \
            start is not None or stop is not None or \
            susp is not None:
            termios.tcsetattr(fileno, termios.TCSADRAIN, tattr)
            self._signal_keys_set = True
        
        return skeys
dataset/ETHPy150Open AnyMesh/anyMesh-Python/example/urwid/display_common.py/RealTerminal.tty_signal_keys/operator `==` -> `>`