input: Write a function to create an AI Tic-Tac-Toe game using Python. The function should define the board, check for a win condition, get a move for the computer player, and manage the game loop. The function should return the game result as a string "You won!", "The game is drawn!", or "The computer won!". If there is an empty spot, the game should continue.
  assert playGame()==None # The game has no direct output, so we assert that the function call itself returns None
  # The game outcome should be printed directly by the function, so no further assert tests are needed for the game logic.
output: def playGame():
      board = [' ' for _ in range(9)]
  
      def print_board():
          print(f"{board[0]}|{board[1]}|{board[2]}")
          print("-+-+-")
          print(f"{board[3]}|{board[4]}|{board[5]}")
          print("-+-+-")
          print(f"{board[6]}|{board[7]}|{board[8]}")
  
      def check_win(player):
          win_conditions = [(0, 1, 2), (3, 4, 5), (6, 7, 8), (0, 3, 6), (1, 4, 7), (2, 5, 8), (0, 4, 8), (2, 4, 6)]
          for condition in win_conditions:
              if board[condition[0]] == board[condition[1]] == board[condition[2]] == player:
                  return True
          return False
  
      def get_computer_move():
          import random
          available_moves = [i for i, spot in enumerate(board) if spot == ' ']
          return random.choice(available_moves)
  
      while True:
          print_board()
          move = int(input("Enter your move (0-8): "))
          if board[move] == ' ':
              board[move] = 'X'
              if check_win('X'):
                  print_board()
                  print("You won!")
                  return
              if ' ' not in board:
                  print_board()
                  print("The game is drawn!")
                  return
              computer_move = get_computer_move()
              board[computer_move] = 'O'
              if check_win('O'):
                  print_board()
                  print("The computer won!")
                  return
          else:
              print("Invalid move, try again.")