input: Write a function to create a TicTacToe game in Python. The function should initialize the game board, display the board, and check if the current player has won the game. The function should return True if the current player has won, otherwise False. If the board is empty, the function should return False.
  
  class TicTacToe:
  
      def __init__(self):
          self.board = [['_' for _ in range(3)] 
                      for _ in range(3)]
          self.turn = 'x'
      
      def display(self):
          for row in self.board:
              print(' '.join(row))
  
      def check_win(self):
          board = self.board
  
          # check if the player with the current turn has a row of three
          for row in self.board:
              if row.count(self.turn) == 3:
                  return True
          
          # check if the player with the current turn has a column of three
          for col in range(3):
              if board[0][col] == board[1][col] and board[1][col] == board[2][col] and board[2][col] == self.turn:
                  return True
          
          # check for the two diagonals
          if board[0][0] == board[1][1] and board[1][1] == board[2][2] and board[2][2] == self.turn:
              return True
          if board[0][2] == board[1][1] and board[1][1] == board[2][0] and board[2][0] == self.turn:
              return True
          return False
  
  assert TicTacToe().check_win() == False
  game = TicTacToe()
  game.board = [['x', 'x', 'x'], ['_', '_', '_'], ['_', '_', '_']]
  assert game.check_win() == True
  game.board = [['x', '_', '_'], ['x', '_', '_'], ['x', '_', '_']]
  assert game.check_win() == True
  game.board = [['_', '_', 'x'], ['_', 'x', '_'], ['x', '_', '_']]
  assert game.check_win() == True
output: def check_win(self):
      board = self.board
  
      # check if the player with the current turn has a row of three
      for row in self.board:
          if row.count(self.turn) == 3:
              return True
      
      # check if the player with the current turn has a column of three
      for col in range(3):
          if board[0][col] == board[1][col] and board[1][col] == board[2][col] and board[2][col] == self.turn:
              return True
      
      # check for the two diagonals
      if board[0][0] == board[1][1] and board[1][1] == board[2][2] and board[2][2] == self.turn:
          return True
      if board[0][2] == board[1][1] and board[1][1] == board[2][0] and board[2][0] == self.turn:
          return True
      return False