class Cars:

    def __init__(self, model, speed, no_of_seats):

        self.model = model

        self.speed= speed

        self.no_of_seats = no_of_seats

    def students_seats(self):

        return self.no_of_seats - 2

class Bus(Cars):

    pass

School_bus = Bus("Ford", 70, 100)

print("students_seats no is:", School_bus.students_seats())