Untitled

sudoku = [
    ["5", "3", ".", ".", "7", ".", ".", ".", "."],
    ["6", ".", ".", "1", "9", "5", ".", ".", "."],
    [".", "9", "8", ".", ".", ".", ".", "6", "."],
    ["8", ".", ".", ".", "6", ".", ".", ".", "3"],
    ["4", ".", ".", "8", ".", "3", ".", ".", "1"],
    ["7", ".", ".", ".", "2", ".", ".", ".", "6"],
    [".", "6", ".", ".", ".", ".", "2", "8", "."],
    [".", ".", ".", "4", "1", "9", ".", ".", "5"],
    [".", ".", ".", ".", "8", ".", ".", "7", "9"]
]
sudoku2 = [
    [".",".","9","7","4","8",".",".","."],
    ["7",".",".",".",".",".",".",".","."],
    [".","2",".","1",".","9",".",".","."],
    [".",".","7",".",".",".","2","4","."],
    [".","6","4",".","1",".","5","9","."],
    [".","9","8",".",".",".","3",".","."],
    [".",".",".","8",".","3",".","2","."],
    [".",".",".",".",".",".",".",".","6"],
    [".",".",".","2","7","5","9",".","."]
]

class Solution(object):
    def solveSudoku(self, board):
        done = []
        for i in range(9):
            for j in range(9):
                if board[i][j]!=".":
                    done.append([i,j])
                else:
                    board[i][j] = ['1','2','3','4','5','6','7','8','9']
        # pboard(board)
        for d in range(9*9):
            if len(done)<=d:
                print("error")
                pboard(board)
                return
            i,j = done[d]
            v = board[i][j]
            bb = [(i//3)*3,(j//3)*3]
            for c in range(9):
                # if c != j:
                if isinstance(board[i][c],list):
                    if v in board[i][c]:
                        board[i][c].remove(v)
                        if len(board[i][c])==1:
                            board[i][c] = board[i][c][0]
                            done.append([i,c])
                # if c != i:
                if isinstance(board[c][j],list):
                    if v in board[c][j]:
                        board[c][j].remove(v)
                        if len(board[c][j])==1:
                            board[c][j] = board[c][j][0]
                            done.append([c,j])
                boxc = [ bb[0] + (c//3) , bb[1] + (c%3) ]
                ci, cj = boxc
                # if boxc != [i,j]:
                if isinstance(board[ci][cj],list):
                    if v in board[ci][cj]:
                        board[ci][cj].remove(v)
                        if len(board[ci][cj]) == 0:  # Empty list, this path is invalid
                            return False
                        if len(board[ci][cj])==1:
                            board[ci][cj] = board[ci][cj][0]
                            done.append([ci,cj])
        pboard(board)


def pboard(board):
    for row in board:
        for column in row:
            print(f"{column} ", end='')
        print("",end='\n')


s = Solution()

s.solveSudoku(sudoku)
s.solveSudoku(sudoku2)