How to use the asciinema.term.raw function in asciinema

flags = fcntl.fcntl(pipe_w, fcntl.F_SETFL, flags)

    signal.set_wakeup_fd(pipe_w)

    old_handlers = _signals(map(lambda s: (s, lambda signal, frame: None),
                                [signal.SIGWINCH,
                                    signal.SIGCHLD,
                                    signal.SIGHUP,
                                    signal.SIGTERM,
                                    signal.SIGQUIT]))

    _set_pty_size()

    start_time = time.time() - time_offset

    with raw(pty.STDIN_FILENO):
        try:
            _copy(pipe_r)
        except (IOError, OSError):
            pass

    _signals(old_handlers)

    os.waitpid(pid, 0)

def play(self, asciicast, idle_time_limit=None, speed=1.0):
        try:
            stdin = open('/dev/tty')
            with raw(stdin.fileno()):
                self._play(asciicast, idle_time_limit, speed, stdin)
        except Exception:
            self._play(asciicast, idle_time_limit, speed, None)

def play(self, asciicast, max_wait=None, speed=1.0):
        if os.isatty(sys.stdin.fileno()):
            with raw(sys.stdin.fileno()):
                self._play(asciicast, max_wait, speed, True)
        else:
            self._play(asciicast, max_wait, speed, False)

flags = fcntl.fcntl(pipe_w, fcntl.F_GETFL, 0)
        flags = flags | os.O_NONBLOCK
        flags = fcntl.fcntl(pipe_w, fcntl.F_SETFL, flags)

        signal.set_wakeup_fd(pipe_w)

        old_handlers = _signals(map(lambda s: (s, lambda signal, frame: None),
                                    [signal.SIGWINCH,
                                     signal.SIGCHLD,
                                     signal.SIGHUP,
                                     signal.SIGTERM,
                                     signal.SIGQUIT]))

        _set_pty_size()

        with raw(pty.STDIN_FILENO):
            try:
                _copy(pipe_r)
            except (IOError, OSError):
                pass

        _signals(old_handlers)

        os.waitpid(pid, 0)
        output.close()