old_contents: # -*- coding: utf-8 -*-
  
  
  class Node(object):
      """ """
      def __init__(self, value, pointer=None):
          self.value = value
          self.pointer = pointer
  
  
  class LinkedList(object):
      """ """
      def __init__(self):
          self.length = 0
          self.header = None
  
      def __len__(self):
          return self.length
  
      def push(self, value):
          temp_node = self.header
          new_node = Node(value, temp_node)
          self.header = new_node
          self.length += 1
  
      def size(self):
          return len(self)
  
  
      #     self.set_init_list(*value)
  
      # def set_init_list(self, *values):
      #     for value in values:
      #         self.length += 1
  
new_contents: # -*- coding: utf-8 -*-
  
  
  class Node(object):
      """ """
      def __init__(self, value, pointer=None):
          self.value = value
          self.pointer = pointer
  
  
  class LinkedList(object):
      """ """
      def __init__(self):
          self.length = 0
          self.header = None
  
      def __len__(self):
          return self.length
  
      def push(self, value):
          temp_node = self.header
          new_node = Node(value, temp_node)
          self.header = new_node
          self.length += 1
  
      def size(self):
          return len(self)
  
      def pop(self):
          pop_node = self.header
          self.header = pop_node.pointer
          return pop_node.value
          
  
  
      #     self.set_init_list(*value)
  
      # def set_init_list(self, *values):
      #     for value in values:
      #         self.length += 1
  
subject: Add a pop function.