old_contents: from rider import AbcRider
  
  
  class OrcRider(AbcRider):
      def __init__(self, name, max_hp=30):
          self.health_meter = max_hp
          self.name = name
          self.unit_type = 'enemy'
          self.is_enemy = True
  
new_contents: from rider import AbcRider
  
  
  class OrcRider(AbcRider):
      def __init__(self, name="", max_hp=30):
          self.health_meter = max_hp
          self.name = name
          self.unit_type = 'enemy'
          self.is_enemy = True
  
subject: fix import