old_contents: import random
  from botfriend.bot import TextGeneratorBot
  
  class ExampleBot(TextGeneratorBot):
  
      def generate_text(self):
          """Tell a joke about numbers."""
          num = random.randint(1,10)
          arguments = dict(
              num=num,
              plus_1=num+1,
              plus_3=num+3
          )
          setup = "Why is %(num)d afraid of %(plus_1)d? "
          punchline = "Because %(plus_1)d ate %(plus_3)d!"
          return (setup + punchline) % arguments
  
  Bot = ExampleBot
  
new_contents: import random
  from botfriend.bot import TextGeneratorBot
  
  class NumberJokes(TextGeneratorBot):
  
      def generate_text(self):
          """Tell a joke about numbers."""
          num = random.randint(1,10)
          arguments = dict(
              num=num,
              plus_1=num+1,
              plus_3=num+3
          )
          setup = "Why is %(num)d afraid of %(plus_1)d? "
          punchline = "Because %(plus_1)d ate %(plus_3)d!"
          return (setup + punchline) % arguments
  
  Bot = NumberJokes
  
subject: Change number-jokes to match the tutorial.