old_contents: class Player(object):
      def __init__(self, name='John Doe'):
          self.name = name
  
new_contents: class Player(object):
      def __init__(self, name='John Doe'):
          self.name = name
  
      def __repr__(self):
          return 'Player(name={name!r})'.format(name=self.name)
  
subject: add player `__repr__`