不懂python中的getch

Question

我正在尝试在python中使用getch类来读取用户的singel charter而不需要输入，我不知道该怎么做，我复制了这个：

        class _Getch:
        """Gets a single character from standard input.  Does not echo to the
    screen."""
        def __init__(self):
            try:
                self.impl = _GetchWindows()
            except ImportError:
                self.impl = _GetchUnix()

        def __call__(self): return self.impl()


    class _GetchUnix:
        def __init__(self):
            import tty, sys

        def __call__(self):
            import sys, tty, termios
            fd = sys.stdin.fileno()
            old_settings = termios.tcgetattr(fd)
            try:
                tty.setraw(sys.stdin.fileno())
                ch = sys.stdin.read(1)
            finally:
                termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
            return ch


    class _GetchWindows:
        def __init__(self):
            import msvcrt

        def __call__(self):
            import msvcrt
            return msvcrt.getch()


    getch = _Getch()

但我不知道接下来应该做什么......