old_contents: # -*- coding: utf-8 -*-
  from __future__ import print_function
  
  
  def hello():
      """ Returns a Hello World"""
      return("Hello, World!")
  
  def say_hello():
      """ Prints Hello World"""
      print(hello())
  
new_contents: from __future__ import print_function
  
  
  def hello():
      """ Returns a Hello World"""
      return("Hello, World!")
  
  def say_hello():
      """ Prints Hello World"""
      print(hello())
  
subject: remove unwanted lines