code: def create_batch_write_structure(table_name, start_num, num_items):
      
      return {
          table_name: [
              {'PutRequest': {'Item': item}}
              for item in get_items(start_num, num_items)
          ]
      }
docs: Create item structure for passing to batch_write_item
  
      :param table_name: DynamoDB table name
      :type table_name: str
      :param start_num: Start index
      :type start_num: int
      :param num_items: Number of items
      :type num_items: int
      :return: dictionary of tables to write to
      :rtype: dict