code: def Append(self, item):
      
      if self._index >= self._size:
        self._index = self._index % self._size
  
      try:
        self._list[self._index] = item
      except IndexError:
        self._list.append(item)
      self._index += 1
docs: Add an item to the list.
  
      Args:
        item (object): item.