sudoku

def is_valid(grid):
 if len(grid)!=81:
   return False
 for a in grid:
   val = int(a)
   if type(val)!= int or val == 0:
     return False

 k = 0
 puzzle = [[0 for x in xrange(9)] for x in xrange(9)]
 for i in range(9):
   for j in range(9):
     puzzle[i][j] = grid[k]
     k = k+1
 print puzzle

 for i in range(9):
   for j in range(9):
     if check_me(puzzle[i][j], i, j, puzzle) == False:
       return False
 return True

def check_me(element, i, j, puzzle):
 for k in range(9):
   if puzzle[i][k] == element:
     if k == j:
       continue
     return False
   if puzzle[k][j] == element:
     if k == i:
       continue
     return False
 return True
 
def check_box(element, i, j, puzzle):
  row_start = (i/3)*3
  col_start = (j/3)*3
  for i in range(row_start, row_start+3):
    for j in range(col_start, col_start+3):
      if puzzle[i][j] == element:
        return False
  return True