属性创建和引用Python类多级继承时出错

您定义属性 self.totalmarks 在里面 display() 方法 Marks 班

因此,当您为奖励()调用合格的_时,此时未定义totalmarks。因此,您可以首先调用display()方法来解决此问题:

m2=Marks()
m2.dispay()
m2.eligible_for_reward()

self.literature self.math self.biology self.physics 目前也没有定义。

你必须添加 ()方法调用所有类以在内部调用super(),并正确实例化该类,如下所示:

class Student:
    def __init__(self):
        self.name = input("Name: ")
        self.age = input("Age: ")
        self.gender = input("Gender: ")

class Test(Student):
    def __init__(self):
        super(Test, self).__init__()
        self.stuClass = input("YearGroup/Class: ")
        print("Enter the marks of the respective subjects")
        self.literature = int(input("Literature: "))
        self.math = int(input("Math: "))
        self.biology = int(input("Biology: "))
        self.physics = int(input("Physics: "))

class Marks(Test):    
    def __init__(self):
        super(Marks, self).__init__()
        self.total_marks = self.literature + self.math + self.biology + self.physics

    def display(self):
        print("\n\nName: ",self.name)
        print("Age: ",self.age)
        print("Gender: ",self.gender)
        print("Class Year Group: ",self.stuClass)

        print("Total Marks: ", self.literature + self.math + self.biology + self.physics)

    def eligible_for_reward(self):
        if self.total_marks>=90 and self.age>13:
            print("You are eligible for the fabulous school sponsored trip to London")
        else:
            print("Sorry, you are not eligible and so are going nowhere....!")

您可以按如下方式使用它:

marks = Marks()
marks.eligible_for_reward()
marks.display()

正如我在评论中提到的,我不认为你子类化的方式有什么原因。所以我把它作为一个班的学生放在一起,就像这样:

class Student:
    # Method
    def __init__(self):
        self.name = input("Name: ")
        self.age = int(input("Age: "))
        self.gender = input("Gender: ")

    def setMarks(self):
         self.stuClass = input("YearGroup/Class: ")
         print("Enter the marks of the respective subjects")
         self.literature = int(input("Literature: "))
         self.math = int(input("Math: "))
         self.biology = int(input("Biology: "))
         self.physics = int(input("Physics: "))
         self.totalmarks=self.literature+self.math+self.biology+self.physics

    def display(self):
         print("\n\nName: ",self.name)
         print("Age: ",self.age)
         print("Gender: ",self.gender)
         print("Class Year Group: ",self.stuClass)
         self.totalmarks=self.literature+self.math+self.biology+self.physics
         print("Total Marks: ", self.literature + self.math + self.biology + self.physics)

    def eligible_for_reward(self):
         if self.totalmarks>=90 and self.age>13:
             print("You are eligible for the fabulous school sponsored trip to London")
         else:
             print("Sorry, you are not eligible and so are going nowhere....!")

示例用法:

s1 = Student()
>>> Name: Hans
>>> Age: 17
>>> Gender: m
s1.setMarks()
>>> YearGroup/Class: 2017
>>> Enter the marks of the respective subjects
>>> Literature: 11
>>> Math: 14
>>> Biology: 42
>>> Physics: 10

s1.display()


>>> Name:  Hans
>>> Age:  17
>>> Gender:  m
>>> Class Year Group:  2017
>>> Total Marks:  77

s1.eligible_for_reward()
>>> Sorry, you are not eligible and so are going nowhere....!

以下是编辑最少的工作代码,希望这能帮助您:-

class Student:
    # Method
    def getStudent(self):
        self.name = input("Name: ")
        self.age = int(input("Age: "))
        self.gender = input("Gender: ")

#The Test Class inherits from the Student Class.
class Test(Student):
    def __init__(self):
        super().__init__()
        super().getStudent()
    # Method
    def getMarks(self):
        self.stuClass = input("YearGroup/Class: ")
        print("Enter the marks of the respective subjects")
        self.literature = int(input("Literature: "))
        self.math = int(input("Math: "))
        self.biology = int(input("Biology: "))
        self.physics = int(input("Physics: "))

# Note that the Marks Class inherits from the Test Class and in doing so inherits from the Student Class
class Marks(Test):
    def __init__(self):
        super().__init__()
        super().getMarks()
    # Method
    def display(self):
        print("\n\nName: ",self.name)
        print("Age: ",self.age)
        print("Gender: ",self.gender)
        print("Class Year Group: ",self.stuClass)
        self.totalmarks=self.literature+self.math+self.biology+self.physics
        print("Total Marks: ", self.literature + self.math + self.biology + self.physics)

    def eligible_for_reward(self):
        if self.totalmarks>=90 and self.age>13:
            print("You are eligible for the fabulous school sponsored trip to London")
        else:
            print("Sorry, you are not eligible and so are going nowhere....!")



mrk = Marks()
mrk.display()
mrk.eligible_for_reward()