在Python中打印一个类中的2d列表？

class Matrix:
    def __init__(self, data):
        self.data = data

class Matrix:
    def __init__(self, data):
        self.data = data
    
    def print_matrix(self):
        for row in self.data:
            for element in row:
                print(element, end=' ')
            print()

matrix_data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
matrix = Matrix(matrix_data)
matrix.print_matrix()

1 2 3 
4 5 6 
7 8 9