python使用pyhook监控键盘并实现切换歌曲的功能

import pythoncom, pyHookimport win32gui,win32api,win32con Lcontrol_press = FalseLmenu_press = FalseLeft_press = False def OnKeyboardEvent(event):  global Lcontrol_press #在函数里面使用全局变量的时候要加上global关键字  global Lmenu_press #要不然会出错  global Left_press  print 'Key:', event.Key  if (event.Key == "Lcontrol"):    Lcontrol_press = True  elif(event.Key == "Lmenu"):    Lmenu_press = True  elif(event.Key == "Left"):    Left_press =True  handel_key()  return Truedef handel_key() :  global Lcontrol_press  global Lmenu_press  global Left_press    if(Lcontrol_press and Lmenu_press and Left_press):    win32api.keybd_event( 0xB0,win32con.VK_MEDIA_NEXT_TRACK,0,0)    Lcontrol_press = False    Lmenu_press = False    Left_press = False     hm = pyHook.HookManager()hm.KeyDown = OnKeyboardEventhm.HookKeyboard()pythoncom.PumpMessages()