Умножение матриц на скаляры и другие матрицы

# Task 4 check 1
mid = Matrix([[1, 0, 0],[0, 1, 0],[0, 0, 1]])
m1 = Matrix([[3, 2], [-10, 0], [14, 5]])
m2 = Matrix([[5, 2, 10], [-0.5, -0.25, 18], [-22, -2.5, -0.125]])
print(mid * m1)
print(mid * m2)
print(m2 * m1)
try:
    m = m1 * m2
    print("WA It should be error")
except MatrixError as e:
    print(e.matrix1)
    print(e.matrix2)

# Task 4 check 2
mid = Matrix([[1, 0, 0],[0, 1, 0],[0, 0, 1]])
m1 = Matrix([[3, 2], [-10, 0], [14, 5]])
m2 = Matrix([[5, 2, 10], [-0.5, -0.25, 18], [-22, -2.5, -0.125]])
print(0.5 * m2)
print(m2 * (0.5 * mid * m1))

# Task 4 check 3
mid = Matrix([[1, 0, 0],[0, 1, 0],[0, 0, 1]])
m1 = Matrix([[3, 2], [-10, 0], [14, 5]])
m2 = Matrix([[5, 2, 10], [-0.5, -0.25, 18], [-22, -2.5, -0.125]])
print(5 * m2)
print(m2 * (120 * mid * m1))

from sys import stdin
from copy import deepcopy
 
 
class MatrixError(BaseException):
    def __init__(self, matrix1, matrix2):
        self.matrix1 = matrix1
        self.matrix2 = matrix2
 
 
class Matrix:
    def __init__(self, list):
        self.list = deepcopy(list)
 
    def __str__(self):
        rows = []
        for row in self.list:
            rows.append('\t'.join(map(str, row)))
        return '\n'.join(rows)
 
    def __add__(self, mtr):
        if self.size() == mtr.size():
            rows = deepcopy(self.list)
            for row in range(len(self.list)):
                for i in range(len(self.list[row])):
                    rows[row][i] += mtr.list[row][i]
        else:
            raise MatrixError(self, mtr)
        return Matrix(rows)
 
    def __mul__(self, n):
        rows = deepcopy(self.list)
        for row in range(len(self.list)):
            for i in range(len(self.list[row])):
                rows[row][i] *= n
        return Matrix(rows)
 
    @staticmethod
    def transposed(m):
        return Matrix(list(map(list, zip(*m.list))))
 
    def transpose(self):
        newList = list(map(list, zip(*self.list)))
        self.list = newList
        return self
 
    def size(self):
        return len(self.list), len(self.list[0])
 
    __rmul__ = __mul__
 
 
exec(stdin.read())