old_contents: class boy:
      gender = 'male'
      interest = 'girl'
  
      def say(self):
          return 'i am a boy'
  
  
  hhj = boy()
  print(hhj.say())
  
new_contents: class boy:
      gender = 'male'
      interest = 'girl'
  
      def say(self):
          return 'i am a boy'
  
  
  hhj = boy()
  print(hhj.say())
  print(hhj.say())
  
subject: Update __init__.py