Question

在此代码中，构造函数首先询问从另一个名为Sun的类创建的sun的名称。 Sun创建一个具有4个属性的sun对象：name，radius，mass和temp。我想在这个solarsystem类中尝试做的是计算所有行星的总质量加上太阳对象的质量，但我对如何访问我通过Sun类创建的sun对象的属性感到困惑。还没有真正找到一个好的解释

我的代码如下：

class SolarSystem:

    def __init__(self, asun):
        self.thesun = asun
        self.planets = []

    def addPlanet(self, aplanet):
        self.planets.append(aplanet)

    def showPlanet(self):
        for aplanet in self.planets:
            print(aplanet)

    def numPlanets(self):
        num = 0;
        for aplanet in self.planets:
            num = num + 1
        planets = num + 1
        print("There are %d in this solar system." % (planets))

    def totalMass(self):
        mass = 0
        sun = self.thesun
        sunMass = sun.mass
        for aplanet in self.planets:
            mass = mass + aplanet.mass
        totalMass = mass + sunMass
        print("The total mass of this solar system is %d" % (mass))

Answer 1

以下代码适用于我，我只需更改print中的totalMass()语句即可使用totalMass，而不是mass：

class SolarSystem:
    def __init__(self, asun):
        self.thesun = asun
        self.planets = []

    def addPlanet(self, aplanet):
        self.planets.append(aplanet)

    def showPlanet(self):
        for aplanet in self.planets:
            print(aplanet)

    def numPlanets(self):
        num = 0;
        for aplanet in self.planets:
            num = num + 1
        planets = num + 1
        print("There are %d in this solar system." % (planets))

    def totalMass(self):
        mass = 0
        sun = self.thesun
        sunMass = sun.mass
        for aplanet in self.planets:
            mass = mass + aplanet.mass
        totalMass = mass + sunMass
        print("The total mass of this solar system is %d" % (totalMass))

class Sun:
    def __init__(self, name, radius, mass, temp):
        self.name = name
        self.radius = radius
        self.mass = mass
        self.temp = temp

test_sun = Sun("test", 4, 100, 2)

test_solar_system = SolarSystem(test_sun)
test_solar_system.totalMass()

在另一个类中使用一个类对象PYTHON

1 个答案: