Question

I’ve encountered a problem with my class file and I can’t seem to find a fix around it. I was hoping someone could point me to the right direction.

Here’s my code:

class Car:
    def __init__(self, year_model, make, speed):
        self.__year_model = year_model
        self.__make = make
        self.__speed = 0

    def set_year_model(self, year_model):
        self.__year_model = year_model

    def set_make(self, make):
        self.__make = make

    def get_year_model(self):
        return self.__year_model

    def get_make(self):
        return self.__make

    def accelerate(self):
        self.__speed + 5
        return self.__speed

    def decelerate(self):
        self.__speed - 5
        return self.__speed

    def get_speed(self):
        return self.__speed 

Essentially, I want the speed attribute set to 0, and have 3 methods (accelerate, decelerate, and get_speed) which add and subtract 5 to the speed attribute and eventually return the speed attribute so it can be printed.

I would guess there’s a problem with my formatting but I can’t seem to find the correct arrangement that would fix the class.

The real program is suppose to loop the accelerate method 5 times, but the class method is supposed to handle the sequential addition and return the final speed.

import car

user_year = 1995
user_make = "toyota"
user_speed = 0

user_car = car.Car(user_year, user_make, user_speed)

for count in range(1,6):
user_car.accelerate()

print user_car.get_speed()

I know this code is very weak, but it’s all makeshift to help make my problem clearer.
So hopefully it’s not too confusing and I can get an answer.

Answer 1

self._speed + 5 computes the current speed plus 5. But you’re not actually storing the computed value anywhere. You want to use self._speed = self._speed + 5, or the more commonly used form, self._speed += 5.