继承问题：AttributeError: 'Vector' 对象没有属性 '_Vector__i'

Question

    class ComplexNumber:
        # setting a Debug value and will be used to ask user if they want to enter degub mode
        Debug = None
        # initiating variables, self consists of real, imag, and complex. 
        def __init__(self, real,imag):
        #The prefix __ is added to make the variable private
            self.__real = real
            self.__imag = imag
        # Overload '+','-' and '*' to make them compatible for 2 by 2 matrix operation
        def __add__(self, o): 
            return ComplexNumber((self.__real + o.__real),(self.__imag + o.__imag))
        def __sub__(self, o): 
            return ComplexNumber((self.__real - o.__real),(self.__imag - o.__imag))
        def __mul__(self,o):
            return ComplexNumber((self.__real * o.__real - self.__imag * o.__imag),\
        (self.__imag * o.__real + self.__real * o.__imag))

    # Create a child class from ComplexNumber
    class Vector(ComplexNumber):
    #inherit the property of real and image as i and j
        def __init__(self, i,j,k):
           super().__init__(i, j)
           self.k = k
        def __add__(self, o): 
           return Vector((self.__i + o.__i),(self.__j + o.__j),(self.__k + o.__k))

    A = Vector(1,0,3)
    B = Vector(1,0,3)
    print(A+B)

我收到一条错误消息“在 add 中返回 Vector((self.__i + o.__i),(self.__j + o.__j),(self.__k + o.__k) )" AttributeError: 'Vector' 对象没有属性 '_Vector__i'

我想创建一个具有更多属性“k”的新子类，并将 2d add 方法更改为 3d add 方法。我在哪里弄错了这个继承？

Answer 1

在Vector 的__add__ 方法中，您无需初始化即可访问属性__i 和__j。这就是您收到错误的原因。