_termui_impl.py 文件源码

def getchar(echo):
        if not isatty(sys.stdin):
            f = open('/dev/tty')
            fd = f.fileno()
        else:
            fd = sys.stdin.fileno()
            f = None
        try:
            old_settings = termios.tcgetattr(fd)
            try:
                tty.setraw(fd)
                ch = os.read(fd, 32)
                if echo and isatty(sys.stdout):
                    sys.stdout.write(ch)
            finally:
                termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
                sys.stdout.flush()
                if f is not None:
                    f.close()
        except termios.error:
            pass
        _translate_ch_to_exc(ch)
        return ch.decode(get_best_encoding(sys.stdin), 'replace')