2448         self._subset.sort(reverse=reverse)

  2448         self._subset.sort(reverse=reverse)

  2449 

  2449 

  2450     def reverse(self):

  2450     def reverse(self):

  2451         self._subset.reverse()

  2451         self._subset.reverse()

  2452 

  2452 

  2456     def isascending(self):

  2453     def isascending(self):

  2457         return self._subset.isascending()

  2454         return self._subset.isascending()

  2458 

  2455 

  2459     def isdescending(self):

  2456     def isdescending(self):

  2460         return self._subset.isdescending()

  2457         return self._subset.isdescending()