Class错误'str'对象没有属性

Question

我的代码出现以下错误：

Enter your first 3x3 matrix: 
    matrices.matrix_one("")
  File "C:\Users\ablev\eclipse-workspace\SDEV300Lab4\matrix.py", line 61, in matrix_one
    self.MATRIX1=[]
AttributeError: 'str' object has no attribute 'MATRIX1'

程序应该要求用户输入两个矩阵，然后计算这两个矩阵的相加。我是 python 的新手，可能 class 的结构有误。任何帮助表示赞赏。谢谢

class matrices:
    
    def __init__(self,MATRIX1,MATRIX2):
        self.MATRIX1 = ''
        self.MATRIX2 = ''

    def matrix_one(self):
        """first matrix"""
        print("Enter your first 3x3 matrix: ")
        self.MATRIX1=[]
        for i in range(3):
            while True:
                row=input().split()
                row=list(map(int,row))
                if len(row) != 3:
                    print("Please enter 3 rows of 3 columns of\
    numbers separated by a space: ")
                else:
                    break
            self.MATRIX1.append(row)
        print("Your first 3x3 matrix is: ")
        for i in range(3):
            for j in range(3):
                print(self.MATRIX1[i][j],end=" ")
            print()
    
    def matrix_two(self):
        """asking user for input of second matrix"""
        print("Enter your second 3x3 matrix: ")
        self.MATRIX2=[]
        for i in range(3):
            while True:
                row=input().split()
                row=list(map(int,row))
                if len(row) != 3:
                    print("Please enter 3 rows of 3 columns of\
    numbers separated by a space: ")
                else:
                    break
            self.MATRIX2.append(row)
        print("Your second 3x3 matrix is: ")
        for i in range(3):
            for j in range(3):
                print(self.MATRIX2[i][j],end=" ")
            print()
    
    def add(self):
        '''function to subtract results of matrix'''
        results = np.add(self.MATRIX1,self.MATRIX2)
        return results

matrices.matrix_one("")
matrices.matrix_two("")

matrices.add("")

Answer 1

通过调用 matrices.matrix_one("")，您将空字符串作为 self 传递给 matrix_one。

您可能想创建一个 class 的实例，以便在调用方法时 self 引用 class 实例：

m = matrices()
m.matrix_one()
m.matrix_two()
m.add()

Class错误'str'对象没有属性

Class error 'str' object has no attribute

python

class