class ReverseListIterator: def init(self, data): self._data = data self._i = len(data) def next(self): if self._i == 0: raise StopIteration self._i -= 1 return self._data[self._i] def iter(self): return ReverseListIterator(self._data)

例子

data = [1, 2, 3, 4, 5] reverse_iter = ReverseListIterator(data) for num in reverse_iter: print(num)