Question

这是我的代码：

class Matrix(object):
    """List of lists, where the lists are the rows of the matrix"""
    def __init__ (self, m=3,n=3,ma=[[1,2,3],[4,5,6], [7,8,9]]):
        self.n_rows=m
        self.n_cols=n
        self.matrix=ma=list(ma)          

    def __repr__(self):
        """String representation of a Matrix"""
        output= "Matrix: \n{} \n Your matrix has \n {} columns \n {} rows"\
                .format(self.matrix, self.n_cols, self.n_rows)
        return output

    def transpose (self):
        """Transpose the Matrix: Make rows into columns and columns into rows"""
        ma_transpose=[] 
        for r in zip(*self.matrix):
            ma_transpose.append(list(r)) 
        return ma_transpose


    def matrixmult (self,other):
        """Matrix Multiplication of 2 Matrices"""
        m2=other.matrix
        ma2_t=m2.transpose()
        table=[]
        for r in self.matrix:
            row=[]
            for n in ma2_t:
                row.append(dot_mult(r,n)) 
                table.append(row)   into a list of row
                res=table
        return res

但每次我尝试使用matrixmult函数时，我总是得到＆＃34;列表对象没有属性matrixmult＆＃34;。这是为什么？我之前在代码no中定义了它？

ma2_t=m2.transpose()

AttributeError：＆＃39; list＆＃39;对象没有属性＆＃39;转置＆＃39;

有人请帮忙吗？

Answer 1

matrixmult()的最后一行返回list。它应该返回一个Matrix对象：

return Matrix(self.n_rows, other.n_cols, res)

同样在transpose方法中，您应该：

return Matrix(self.n_cols, self.n_rows, ma_transpose)

为什么我总是得到错误＆＃34; list＆＃34;对象没有属性＆＃39;转置＆＃39;？

1 个答案: