如何检测当前关注的应用程序？

!！我自己弄清楚了：

import Xlib.displaydisplay = Xlib.display.Display()window = display.get_input_focus().focuswmname = window.get_wm_name()wmclass = window.get_wm_class()if wmclass is None and wmname is None:    window = window.query_tree().parent    wmname = window.get_wm_name()print "WM Name: %s" % ( wmname, )