在另一个 class PYTHON 中使用一个 class 对象

Question

在此代码中，构造函数首先询问从另一个名为 Sun 的 class 创建的太阳的名称。 Sun 创建一个具有 4 个属性的太阳对象：名称、半径、质量和温度。我想在这个太阳系 class 中做的是计算所有行星的总质量加上太阳物体的质量，但我很困惑如何访问我通过太阳创建的太阳物体的属性class。还没真正找到好的解释

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

以下代码对我有用，我只需要将 totalMass() 中的 print 语句更改为使用 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 class PYTHON 中使用一个 class 对象

Using one class object in another class PYTHON

python

class

object

instance