hayd

#Note this requires the function solve_sudoku.

def Sudoku(grid):
    def __init__(self):
        self.grid = grid
        self.solution = solve_sudoku(self.grid)
        self.hints = self.get_hints()

    def solvable(self):
        return bool(self.solution)

hayd

def check_sudoku(grid):
    '''If grid is a valid sudoku board, so far filled-in correctly: returns True
      else if grid is a valid sudoku board but has been filled-in incorrectly: returns False
      else: returns None

      Note: returning True does not imply there is a solution for grid, see solve_sudoku.
    '''
    def sanity_check():
        '''If grid is of the sudoku board format: returns True
          else: returns None