汽车类Python程序

Question

这是我的代码。结果，我不断收到名称错误。我应该如何解决这个问题？

车类

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

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

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

    def set_speed(self, speed):
        self.__speed = 0

    def get_year_model(self):
        return self.__year_model

    def get_make(self):
        return self.__make

    def get_speed(self):
        return self.__speed

    #methods
    def accelerate(self):
        self.speed +=5

    def brake(self):
        self.speed -=5

    def get_speed(self):
        return self.speed

程序

import Lab9_prob2

def main():

    year = input('Enter the car year: ')
    make = input('Enter the car make: ')
    speed = 0

    #Accelerate 5 times
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())

    #Brake 5 times
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    my_car.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    my_car.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    my_car.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    my_car.brake()
    print('The current speed after brake is: ', mycar.get_speed())

#Call the main function
main()

原文由 canigetanohyeah 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

您的代码有几个问题：

• 您尚未创建实例： mycar = Car(year, make, speed)

• 您已将 mycar 重命名为 my_car ：即 my_car.brake()

• 类属性被称为 self.__speed ，它不被称为 self.speed 。（加速，制动和get_speed方法）

---

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

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

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

    def set_speed(self, speed):
        self.__speed = 0

    def get_year_model(self):
        return self.__year_model

    def get_make(self):
        return self.__make

    def get_speed(self):
        return self.__speed

    #methods
    def accelerate(self):
        self.__speed +=5

    def brake(self):
        self.__speed -=5

    def get_speed(self):
        return self.__speed

def main():

    year = input('Enter the car year: ')
    make = input('Enter the car make: ')
    speed = 0

    mycar = Car(year, make, speed)

    #Accelerate 5 times
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())
    mycar.accelerate()
    print('The current speed is: ', mycar.get_speed())

    #Brake 5 times
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())
    mycar.brake()
    print('The current speed after brake is: ', mycar.get_speed())

#Call the main function
main()

原文由 eyllanesc 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

类车：

 def __init__(self,year,make):
    self.__year_model=year
    self.__make=make
    self.__speed=0

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

def brake(self):
    self.__speed -=5

def get_speed(self):
    return self.__speed

新文件

进口车

def main(): my_car = car.Car(2019,“丰田”)

 for i in range(5):
    my_car.accelerate()
    print("Speed = ",my_car.get_speed())

for i in range(5):
    my_car.brake()
    print("Speed = ",my_car.get_speed())

主要的（）

原文由 Catelyn 发布，翻译遵循 CC BY-SA 4.0 许可协议