Python面向对象编程-自定义异常使用（一）

class InvalidMoveError(Exception):
    def __init__(self, message):
        self.message = message

class Game:
    def __init__(self):
        self.board = [['', '', ''] for i in range(3)]
        self.current_player = 'X'
    
    def display_board(self):
        for row in self.board:
            print(row)
    
    def make_move(self, row, col):
        if row < 0 or row > 2 or col < 0 or col > 2:
            raise InvalidMoveError("Invalid move. Please choose a row and column between 0 and 2.")
        if self.board[row][col] != '':
            raise InvalidMoveError("Invalid move. That square is already taken.")
        
        self.board[row][col] = self.current_player
        
        if self.current_player == 'X':
            self.current_player = 'O'
        else:
            self.current_player = 'X'
    
    def is_game_over(self):
        for i in range(3):
            if self.board[i][0] == self.board[i][1] == self.board[i][2] != '':
                return True
            if self.board[0][i] == self.board[1][i] == self.board[2][i] != '':
                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

game = Game()

while not game.is_game_over():
    game.display_board()
    row = int(input("Enter row (0-2): "))
    col = int(input("Enter column (0-2): "))
    try:
        game.make_move(row, col)
    except InvalidMoveError as e:
        print("Error:", e.message)

game.display_board()
print("Game over!")