Question

I have a 9×9 sudoku board. I have to create 9 subsquare lists. I store each of these lists as a row in another list called sub_square.

CODE:

sub_square = []
sub_list = []
for x in range(0,3):
    for y in range(0,3):
        sub_list.append(sudoku[x][y])

sub_square.append(sub_list)
sub_list = []

for x in range (0,3):
    for y in range(3,6):
        sub_list.append(sudoku[x][y])

sub_square.append(sub_list)
sub_list = []

for x in range (0,3):
    for y in range(6,9):
        sub_list.append(sudoku[x][y])

sub_square.append(sub_list)
sub_list = []

I do the same for the other 6 sub squares. Is there any other way that is much simpler.

SUDOKU:

 [0, 9, 4, 3, 0, 0, 0, 0, 0],
 [0, 0, 7, 5, 0, 0, 0, 0, 0],
 [0, 0, 1, 4, 0, 0, 0, 2, 0],

 [4, 6, 0, 8, 0, 0, 0, 0, 3],
 [0, 0, 0, 0, 0, 0, 0, 0, 0],
 [2, 0, 0, 0, 0, 3, 0, 6, 9],

 [0, 5, 0, 0, 0, 6, 2, 0, 0],
 [0, 0, 0, 0, 0, 5, 1, 0, 0],
 [0, 0, 0, 0, 0, 1, 6, 4, 0]

so the first sub square list is:

[0, 9, 4, 0, 0, 7, 0, 0, 1]

Answer 1

Yes, there is an easier way:

subsquares = [[sudokuSquare[j][i] for j in range(x, x + w) for i in range(y, y + h)] for x in range(0, 9, 3) for y in range(0, 9, 3)]

Where h and w would be the height and width of each subsquare, respectively. (For your purposes, h and w would both equal 3.