类对象得到意外的参数错误

Question

我是 Python 新手，正在尝试编写 Python 类。但在下文中，对于 car_1、car_2 和 car_3（粗体）的属性，我收到“意外参数”错误。如何纠正它？还是 Pycharm 的问题？谢谢！

import random


class Vehicle:
    def _init_(self, make, model, year, weight):
        self.make = make
        self.model = model
        self.year = year
        self.weight = weight


class Car(Vehicle):
    def _init_(self, make, model, year, weight, is_driving=True, trips_since_maintenance=0, needs_maintenance=False):
        super().__init__(make, model, year, weight)
        self.is_driving = is_driving
        self.trips_since_maintenance = 0
        self.needs_maintenance = needs_maintenance

    def drive(self):
        drive = 0
        if drive > 0:
            self.is_driving = True

    def stop(self):
        stop = 0
        while self.drive():
            stop += 1
            break
            self.is_driving = False
            self.trips_since_maintenance += 1
            if self.trips_since_maintenance >= 100:
                self.needs_maintenance = True

    def repair(self):
        self.needs_maintenance = False
        self.trips_since_maintenance = 0


def randomly_drive_car(car):
    drive_times = random.randint(1, 101)
    for i in range(drive_times):
        Car.drive()
        Car.stop()


**car_1 = Car('Honda', 'City', '2018', '1153 kg')
car_2 = Car('Toyota', 'Altis', '2018', '1745 kg')
car_3 = Car('Mazda', '_3', '2020', '1260 kg')**

randomly_drive_car(car_1)
randomly_drive_car(car_2)
randomly_drive_car(car_3)

Answer 1

除了你需要为 init 方法添加两个下划线之外，其他都是正确的。

class Vehicle:
    def __init__(self, make, model, year, weight):
       ...

class Car(Vehicle):
    def __init__(self, make, model, year, weight, is_driving=True, trips_since_maintenance=0, needs_maintenance=False):
    super().__init__(make, model, year, weight)

编辑： 在第 42/43 行，您正在调用“Car.drive”，您应该调用“car.drive()”（小写 C），因为您的函数参数称为“car”。通过使用Car.drive()，您试图将驱动方法作为类方法调用。

编辑 2（来自 cmets）：

import random

class Car(Vehicle):

    ...

    def take_trip(self):
        self.trips_since_maintenance += 1
        if self.trips_since_maintenance >= 100:
            self.needs_maintenance = True


def randomly_drive_car(car):
    drive_times = random.randint(1, 101)
    for i in range(drive_times):
        car.take_trip()


car_1 = Car('Honda', 'City', '2018', '1153 kg')
car_2 = Car('Toyota', 'Altis', '2018', '1745 kg')
car_3 = Car('Mazda', '_3', '2020', '1260 kg')

randomly_drive_car(car_1)
randomly_drive_car(car_2)
randomly_drive_car(car_3)