old_contents: from functools import reduce
  
  compare = [1,2,3,4,5,6,7,8,9]
  
  def validSolution(board):
      
      for i in board:
          if sorted(i) == compare: continue
          else: return False
              
      for i in zip(*board):
          if sorted(i) == compare: continue
          else: return False
      
      for j in range(0,9,3):
      	if checker([board[j][:3],board[j+1][:3],board[j+2][:3]]) and \
      	   checker([board[j][3:6],board[j+1][3:6],board[j+2][3:6]]) and \
      	   checker([board[j][6:],board[j+1][6:],board[j+2][6:]]):
      		continue
      	else:
      		return False
      return True
  
  def checker(three_by_three):
      if sorted(list(reduce(lambda x,y: x+y, three_by_three))) == compare:
          return True
      return False
  
new_contents: from functools import reduce
  
  compare = [1,2,3,4,5,6,7,8,9]
  
  def validSolution(board):
      for i in board:
          if sorted(i) == compare: continue
          else: return False
              
      for i in zip(*board):
          if sorted(i) == compare: continue
          else: return False
      
      for j in range(0,9,3):
          if checker([board[j][:3],board[j+1][:3],board[j+2][:3]]) and \
              checker([board[j][3:6],board[j+1][3:6],board[j+2][3:6]]) and \
              checker([board[j][6:],board[j+1][6:],board[j+2][6:]]):
              continue
          else:
              return False
      return True
  
  def checker(three_by_three):
      if sorted(list(reduce(lambda x,y: x+y, three_by_three))) == compare:
          return True
      return False
  
subject: Update 4kyu_sudoku_solution_validator.py