code: def __next__(self):
      if self.node is None:
          raise StopIteration
      else:
          x = self.node.value
          self.node = self.node.prev
          return x
  
imports: from collections.abc import Iterable, Iterator
label_desc: Use image node_id 2 for calling the ListIterator obj's underlying member method code with example usage: obj.__next__() and returns: x