def append(self, item, item_size):
    """Add new item to the list.

    Args:
      item: an item to add to the list.
      item_size: item size in bytes as int.
    """
    self.items.append(item)
    self.length += 1
    self.size += item_size
Add new item to the list.

    Args:
      item: an item to add to the list.
      item_size: item size in bytes as int.
    
mapreduce/context.py