Solution2

app/main.py

@@ -26,27 +26,26 @@ def __init__(
  self.count_of_ratings = count_of_ratings
 
  def serve_cars(self, cars: list) -> float:
- if not cars or not len(cars):
+ if not cars:
  return 0
 
- summ = 0
+ total_price = 0
  for car in cars:
  if self.clean_power > car.clean_mark:
- print(self.calculate_washing_price(car))
- summ += self.calculate_washing_price(car)
+ total_price += self.calculate_washing_price(car)
  self.wash_single_car(car)
- return summ
+ return total_price
 
  def calculate_washing_price(self, car: any) -> float:
  return round(
  car.comfort_class * (self.clean_power - car.clean_mark)
  * self.average_rating / self.distance_from_city_center, 1)
 
- def wash_single_car(self, car: any) -> None:
+ def wash_single_car(self, car: Car) -> None:
  if self.clean_power > car.clean_mark:
  car.clean_mark = self.clean_power
 
- def rate_service(self, rate: int) -> None:
+ def rate_service(self, rate: Car) -> None:
  rating = self.average_rating
  count = self.count_of_ratings
  new_rating = ((rating * count) + rate) / (count + 1)