matrix_bobsya

from sys import stdin
from copy import deepcopy


class Matrix:

    def __init__(self, a):
        self.matrix = deepcopy(a)

    def __str__(self):
        string = ''
        for i in self.matrix:
            string += '\t'.join(map(str, i)) + '\n'
        return string.strip()

    def size(self):
        self.column = len(self.matrix[0])
        if self.column == 0:
            return 0, 0

        self.row = len(self.matrix)

        return self.row, self.column

    def __add__(self, other):
        add = deepcopy(other)
        self.size()
        new = Matrix([])

        for i in range(self.row):
            newRow = []
            for j in range(self.column):
                newRow.append(self.matrix[i][j] + add.matrix[i][j])
            new.matrix.append(newRow)

        return new.matrix

    def __mul__(self, other):
        add = deepcopy(other)
        self.size()
        new = Matrix([])

        for i in range(self.row):
            newRow = []
            for j in range(self.column):
                newRow.append(self.matrix[i][j] * add)
            new.matrix.append(newRow)

        return new.matrix

    def __rmul__(self, other):
        return self * other

# exec(stdin.read())



m1 = Matrix([[1, 0, 0], [0, 1, 0], [0, 0, 1]])
m2 = Matrix([[0, 1, 0], [20, 0, -1], [-1, -2, 0]])
# print(m1 + m2)
print(m1)

m = Matrix([[1, 1, 0], [0, 2, 10], [10, 15, 30]])
alpha = 15
#print(m * alpha)
#print(alpha * m)