Python 如何在类中使用方法来比较该类的两个对象

大家好，我是python中oop的新手。我试着写一个学生班，得到学生人数、年龄、身高和体重，并将这些信息存储为3个单独的列表

我的目标是计算平均年龄、体重和身高。到目前为止我没有任何问题

在下一步中，我想比较两个类实例的平均年龄加上权重的平均值

因为这是oop中的一个练习，所以我应该用类的方法来做。 但是，我不知道是否可以在原始类（class-School）中使用方法，或者我应该创建一个子类来比较School类的两个实例的属性

非常感谢您的帮助

这是我的密码：

class School:

    avg_age = 0
    avg_heigt = 0
    avg_weight = 0

    def __init__(self):

        self.n =int(input())

        self.list_ages = [float(x) for x in input().split(" ")]

        self.list_higt = [float(x) for x in input().split(" ")]

        self.list_weight = [float(x) for x in input().split(" ")]      

    def get_av(self):
        School.avg_age = sum(self.list_ages) / len(self.list_ages)

        School.avg_heigt = sum(self.list_higt)/len(self.list_higt)

        Scoohl.avg_weight = sum(self.list_weight)/len(self.list_weight)
        return("{},{},{}".format(School.avg_age,School.avg_heigt,School.avg_weight))  

---

可以混合使用类属性和实例属性。类属性在实例之间共享：

class Banks:
    total = 0
    def __init__(self,name,money):
        self.name=name
        self.money=money
        Banks.total += money


b1 = Banks("one",100)
b2 = Banks("two",5000000)

# prints 5000100 - all the money of all banks, 
# does not help you comparing avgs ov instances at all
print(b1.total)  

输出：

5000100

每个实例需要单独的平均值，并且需要一个函数将一个实例（

self

）与另一个

实例进行比较：

class School: 
    def __init__(self): 
        # self.n =int(input()) # not needed - use len(one of your lists) 
        list_ages = [float(x) for x in input("Gimme ages, space seperated: ").split()] 
        list_hight = [float(x) for x in input("Gimme hights, space seperated: ").split()] 
        list_weight = [float(x) for x in input("Gimme weights, space seperated: ").split()] 

        # shortest list downsizes all other lists 
        self.list_ages, self.list_hight, self.list_weight = zip(
            *zip( list_ages,list_hight,list_weight ))

    def get_av(self):
        self.avg_age = sum(self.list_ages) / len(self.list_ages)
        print(self.avg_age)
        self.avg_height = sum(self.list_hight) / len(self.list_hight)
        print(self.avg_height)
        self.avg_weight = sum(self.list_weight) / len(self.list_weight)
        print(self.avg_weight)  
        return  self.avg_age, self.avg_height, self.avg_weight

    def compare(self,other):
        self.get_av()
        other.get_av()
        print("Our pupils are younger: ", self.avg_age < other.avg_age)
        print("Our pupils are smaller: ", self.avg_height < other.avg_height)
        print("Our pupils are lighter: ", self.avg_weight < other.avg_weight)

c = School() # 4 5 6        22 44 66 88 99       20.2 20.2 20.2 20.2 20.2 20.2
d = School() # 100          100                  100

c.compare(d)

更多信息：




您可以通过使用一个或多个参数创建一个实例函数，或使用decorator的静态方法样式来实现

class School:
    # your code

    def compare_to(self, other)
    # compare an instancte with other instance
    # your compare code here
        pass

    @staticmethod
    def compare(first_school, second_school):
    # first and second school are two objects of class school
    # your compare code
        pass

你可以用两种方式调用你的函数

s1 = School()
s2 = School()
# Your init data
s1.compare_to(s2)
School.compare(s1, s2)

编辑：作为@Patrick answer，您应该将变量声明为实例变量，以使每个实例的存储方式不同

s1 = School()
s2 = School()
# Your init data
s1.compare_to(s2)
School.compare(s1, s2)