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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()