old_contents: class Node:
      def __init__(self, value, next_node=None):
          self._value = value
          self._next_node = next_node
  
      def value(self):
          return self._value
  
      def next(self):
          return self._next_node
  
  
  class LinkedList:
      def __init__(self, values=[]):
          self._size = 0
          self._head = None
          self._current = None
  
          for value in values:
              self.push(value)
  
      def __len__(self):
          return self._size
  
      def head(self):
          if self._head is None:
              raise EmptyListException("Head is empty")
          return self._head
  
      def push(self, value):
          node = Node(value, self._head)
          self._head = node
          self._size += 1
  
      def pop(self):
          current_head = self.head()
          self._head = current_head.next()
          self._size -= 1
          return current_head.value()
  
      def reversed(self):
          return LinkedList(self)
  
      def __iter__(self):
          return LinkedListIterator(self)
  
  
  class LinkedListIterator:
      def __init__(self, linked_list):
          self.current = linked_list._head
  
      def __iter__(self):
          return self
  
      def __next__(self):
          if self.current is None:
              raise StopIteration
          value = self.current.value()
          self.current = self.current.next()
          return value
  
  
  class EmptyListException(Exception):
      def __init__(self, message):
          self.message = message
  
new_contents: class Node:
      def __init__(self, value, next_node=None):
          self._value = value
          self._next_node = next_node
  
      def value(self):
          return self._value
  
      def next(self):
          return self._next_node
  
  
  class LinkedList:
      def __init__(self, values=[]):
          self._size = 0
          self._head = None
  
          for value in values:
              self.push(value)
  
      def __len__(self):
          return self._size
  
      def head(self):
          if self._head is None:
              raise EmptyListException("Head is empty")
          return self._head
  
      def push(self, value):
          new_node = Node(value, self._head)
          self._head = new_node
          self._size += 1
  
      def pop(self):
          current_head = self.head()
          self._head = current_head.next()
          self._size -= 1
          return current_head.value()
  
      def reversed(self):
          return LinkedList(self)
  
      def __iter__(self):
          return LinkedListIterator(self)
  
  
  class LinkedListIterator:
      def __init__(self, linked_list):
          self._current = linked_list._head
  
      def __iter__(self):
          return self
  
      def __next__(self):
          if self._current is None:
              raise StopIteration
          current_value = self._current.value()
          self._current = self._current.next()
          return current_value
  
  
  class EmptyListException(Exception):
      def __init__(self, message):
          self.message = message
  
subject: Improve instance variable names