new_contents: from __future__ import print_function
  
  
  class List(object):
      """List class."""
      def __init__(self):
          pass
  
      def add(self, item):
          pass
  
      def remove(self, item):
          pass
  
      def search(self, item):
          pass
  
      def is_empty(self):
          pass
  
      def length(self):
          pass
  
      def append(self, item):
          pass
  
      def index(self, item):
          pass
  
      def insert(self, pos, item):
          pass
  
      def pop(self, pos):
          pass
  
subject: Add ds: unordered list