code: def setProperty(self, prop, *args, **kwargs):
          
          f = self.__setAttrs.get(prop)
          if not f:
              raise KeyError('Unknown writable property: %s' % prop)
          f(self, *args, **kwargs)
docs: Set the value of a property by sending an event on the root window.
          See the corresponding method for the required arguments. For example,
          for the property _NET_WM_STATE, look for :meth:`setWmState`