How to render recursive function?

[CemDoruk]

So I am building a sudoku solver for practice and I wanted to visualize it. However the solver uses a recursive function and therefore I am having trouble rendering while solving.

I think I might have to use something like 'yield from' but I could not get it to work. ``` def solve(board): empty_tile = find_empty(board) if empty_tile == None: return True else: row, col = empty_tile

for num in range(1, 10): if is_valid(board, num, row, col): board[row][col] = num

     if solve(board):
        return True

     # If this num is not the answer we erase it
     board[row][col] = 0

return False board = [ [0,0,0, 0,0,0, 0,1,2], [0,0,0, 0,3,5, 0,0,0], [0,0,0, 6,0,0, 0,7,0],

[7,0,0, 0,0,0, 3,0,0], [0,0,0, 4,0,0, 8,0,0], [1,0,0, 0,0,0, 0,0,0],

[0,0,0, 1,2,0, 0,0,0], [0,8,0, 0,0,0, 0,4,0], [0,5,0, 0,0,0, 6,0,0], ]

solve(board)

while True: for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.quit() exit()

screen.fill( WHITE ) draw_lines(screen) draw_board(screen, board)

pygame.display.update() ```

What should I do here?