def get_matrix():
    filename: str = 'macierz.txt'
    matrix = []

    with open(filename, "r") as file:
        data = file.read().splitlines()

    for line in range(0, len(data)):
        split_vales = [int(x) for x in data[line].split(" ")]
        matrix.append(split_vales)

    return matrix


def dot_product():
    matrix = get_matrix()
    rows, columns = len(matrix), len(matrix[0])
    result = [[0] * columns for _ in range(rows)]
    for row in range(rows):
        for column in range(columns):
            result[row][column] = sum(matrix[row][i] * matrix[i][column] for i in range(len(matrix)))
    return result


if __name__ == '__main__':
    dot = dot_product()
    print("Macierz pomnożona przez samą siebie wynosi: {}".format(dot))