2460         it = self._subset.fastdesc

  2460         it = self._subset.fastdesc

  2461         if it is None:

  2461         if it is None:

  2462             return None

  2462             return None

  2463         return lambda: self._iterfilter(it())

  2463         return lambda: self._iterfilter(it())

  2464 

  2464 

  2468     def __nonzero__(self):

  2465     def __nonzero__(self):

  2469         for r in self:

  2466         for r in self:

  2470             return True

  2467             return True

  2471         return False

  2468         return False

  2472 

  2469