新代码

Question

实施具有以下属性的类Car。一辆车有一辆一定的燃油效率（以英里/加仑计）油箱中的燃油量。效率在中指定构造函数，初始燃油油位为0.供应方法驱动模拟驾驶汽车一定距离，减少油箱中的燃油油位，以及方法getGasLevel，返回当前的燃料水平，以及加油，加油。样品用法：
myHybrid = Car(50)
myHybrid.addGas(20)
myHybrid.drive(100)
print(myHybrid.getGasLevel())
编写一个主程序来测试你的课程。

我的代码：

class Car(object):
    def __init__(self, fuelEfficiency):
        super(Car, self).__init__()
        self.fuelEfficiency = fuelEfficiency
        self.fuelLevel = 0  #   In gallons


    #   Returns the amount of gas
    def getGasLevel(self):
        return self.fuelLevel

    #   Adds gas
    def addGas(self, gasToAdd):
        self.fuelLevel += gasToAdd

    #   Simulates driving car for a given distance
    #   and reduces the amount of gas based on the
    #   fuelEfficiency.
    def drive(self, distanceInMiles):
        gasToRemove = self.fuelEfficiency * distanceInMiles

        self.fuelLevel -= gasToRemove

        #   Ensure we don't go below zero gas
        self.fuelLevel = max(self.fuelLevel,0)


def main():

    myHybrid=Car(50)
    myHybrid.addGas(20)
    myHybrid.drive(100)
    print(myHybrid.getGasLevel())

Answer 1

您实际上需要致电main()

在底部添加以下行（无缩进）：

if __name__ == '__main__': 
    main()

Answer 2

一些事情：

您不会调用main()。我怀疑这是一个复制和粘贴错误。
你搞砸了减少燃料的数学。而不是self.fuelEfficiency * distanceInMiles它应该是distanceInMiles / self.fuelEfficiency。您当前的代码减去100 * 50加仑而不是12加仑。因此，显然，你的燃料将达到0。

新代码

class Car(object):
    def __init__(self, fuelEfficiency):
        super(Car, self).__init__()
        self.fuelEfficiency = fuelEfficiency
        self.fuelLevel = 0  #   In gallons

    #   Returns the amount of gas
    def getGasLevel(self):
        return self.fuelLevel

    #   Adds gas
    def addGas(self, gasToAdd):
        self.fuelLevel += gasToAdd

    #   Simulates driving car for a given distance
    #   and reduces the amount of gas based on the
    #   fuelEfficiency.
    def drive(self, distanceInMiles):
        gasToRemove = distanceInMiles / self.fuelEfficiency
        self.fuelLevel -= gasToRemove
        #   Ensure we don't go below zero gas
        self.fuelLevel = max(self.fuelLevel,0)


def main():
    myHybrid=Car(50)
    myHybrid.addGas(20)
    myHybrid.drive(100)
    print(myHybrid.getGasLevel())

if __name__ == '__main__': 
    main()

不知道我的错误是什么（python）

2 个答案:

新代码