input: 
  def TicTacToe():
      """Create a TicTacToe game in Python. This function initializes a game board 
      and checks for win conditions. The game board is a 3x3 grid where players 
      take turns placing 'x' or 'o'. The game checks for a win by verifying if a 
      player has three of their marks in a row, column, or diagonal.
      
      Example:
      tic_tac_toe_game = TicTacToe()
      tic_tac_toe_game.board = [['x', '_', 'o'], ['x', 'o', 'o'], ['x', '_', '_']]
      tic_tac_toe_game.check_win()
      Output: True
      """
  
output:     
      class TicTacToe:
          def __init__(self):
              self.board = [['_' for _ in range(3)] for _ in range(3)]
              self.current_player = 'x'
          
          def switch_player(self):
              self.current_player = 'o' if self.current_player == 'x' else 'x'
          
          def place_mark(self, row, col):
              if self.board[row][col] == '_':
                  self.board[row][col] = self.current_player
                  self.switch_player()
          
          def check_win(self):
              for row in self.board:
                  if row[0] == row[1] == row[2] != '_':
                      return True
              for col in range(3):
                  if self.board[0][col] == self.board[1][col] == self.board[2][col] != '_':
                      return True
              if self.board[0][0] == self.board[1][1] == self.board[2][2] != '_':
                  return True
              if self.board[0][2] == self.board[1][1] == self.board[2][0] != '_':
                  return True
              return False
      
      return TicTacToe()
  