input: 
  def create_tic_tac_toe_game() -> TicTacToe:
      """ Create a TicTacToe game in Python.
      >>> game = create_tic_tac_toe_game()
      >>> game.board
      [['_', '_', '_'], ['_', '_', '_'], ['_', '_', '_']]
      >>> game.turn
      'x'
      """
  
output:     class TicTacToe:
          def __init__(self):
              self.board = [['_' for _ in range(3)] for _ in range(3)]
              self.turn = 'x'
  
      return TicTacToe()