Python可跨平台实现获取按键的方法

本文实例讲述了Python可跨平台实现获取按键的方法。分享给大家供大家参考。具体如下：

class _Getch:  

    """Gets a single character from standard input.  Does not echo to the screen.""" 

    def __init__(self):  

        try:  

            self.impl = _GetchWindows()  

        except ImportError:  

            try:  

                self.impl = _GetchMacCarbon()  

            except AttributeError:  

                self.impl = _GetchUnix()  

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

class _GetchUnix:  

    def __init__(self):  

        import tty, sys, termios # import termios now or else you'll get the Unix version on the Mac  

    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()  

class _GetchMacCarbon:  

    """  

    A function which returns the current ASCII key that is down;  

    if no ASCII key is down, the null string is returned.  The  

    page http://www.mactech.com/macintosh-c/chap02-1.html was  

    very helpful in figuring out how to do this.  

    """ 

    def __init__(self):  

        import Carbon  

        Carbon.Evt #see if it has this (in Unix, it doesn't)  

    def __call__(self):  

        import Carbon  

        if Carbon.Evt.EventAvail(0x0008)[0]==0: # 0x0008 is the keyDownMask  

            return ''  

        else:  

            #  

            # The event contains the following info:  

            # (what,msg,when,where,mod)=Carbon.Evt.GetNextEvent(0x0008)[1]  

            #  

            # The message (msg) contains the ASCII char which is  

            # extracted with the 0x000000FF charCodeMask; this  

            # number is converted to an ASCII character with chr() and  

            # returned  

            #  

            (what,msg,when,where,mod)=Carbon.Evt.GetNextEvent(0x0008)[1]  

            return chr(msg & 0x000000FF)  

if __name__ == '__main__': # a little test  

   print 'Press a key' 

   inkey = _Getch()  

   import sys  

   for i in xrange(sys.maxint):  

      k=inkey()  

      if k<>'':break 

   print 'you pressed ',k

希望本文所述对大家的Python程序设计有所帮助。

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