old_contents: __author__ = 'karl.gong'
  
  
  class Identifier:
      @staticmethod
      def id(element):
          return "id=" + element.get_attribute("id")
  
      @staticmethod
      def class_name(element):
          return "class=" + element.get_attribute("class")
  
      @staticmethod
      def name(element):
          return "name=" + element.get_attribute("name")
  
      @staticmethod
      def link_text(element):
          return "link=" + element.get_text()
  
      @staticmethod
      def index(element):
          pass # todo:
  
new_contents: __author__ = 'karl.gong'
  
  
  class Identifier:
      @staticmethod
      def id(element):
          return "id=" + element.get_attribute("id")
  
      @staticmethod
      def class_name(element):
          return "class=" + element.get_attribute("class")
  
      @staticmethod
      def name(element):
          return "name=" + element.get_attribute("name")
  
      @staticmethod
      def link_text(element):
          return "link=" + element.get_text()
  
subject: Remove identified by index.