Python井字棋问题：玩家获胜后AI仍落子、平局无提示

问题分析与修复思路 #

1. 玩家获胜后电脑仍落子 #

当前代码中，get_move方法会让玩家先落子，随后直接执行电脑的落子逻辑，没有在玩家落子后立即检查胜负。这导致玩家获胜后，电脑依然会继续操作。

修复方式：在玩家落子后，先调用check_winner检查是否获胜，若已产生赢家则终止当前回合，不再执行电脑的落子逻辑。

2. 平局时无提示且游戏不终止 #

check_winner方法中仅打印平局提示，但未返回特定标识，且play_game的循环仅判断是否有赢家，忽略了平局情况。这导致平局时游戏会继续循环，无法正常结束。

修复方式：让check_winner在平局时返回"TIE"标识，然后在play_game的循环中增加对平局的判断，终止游戏并展示结果。

修改后的完整代码 #

import random

print("Welcome to tic-tac-toe. You will be battling with a dumb AI")


class TicTacToe:
    # create the board
    def __init__(self):
        self.board = []
        self.player = ""

    def player_choice(self):
        while True:
            choice = input("\nPlease Select if you want O or X \n1. O\n2. X\nEnter your choice: ")
            if choice == "1":
                print("You picked \"O\"  ")
                self.player = "O"
                break
            elif choice == "2":
                print("You picked \"X\"  ")
                self.player = "X"
                break
            else:
                print("Invalid Input")

    def create_board(self):
        for i in range(3):
            self.board.append(["-"] * 3)

    def print_board(self):
        for row in self.board:
            print("|".join(row))

    # Check winner
    def check_winner(self):
        # check row
        for row in self.board:
            if row[0] == row[1] == row[2] and row[0] != "-":
                return row[0]
        # check column
        for col in range(3):
            if self.board[0][col] == self.board[1][col] == self.board[2][col] and self.board[0][col] != "-":
                return self.board[0][col]
        # check diagonal
        if self.board[0][0] == self.board[1][1] == self.board[2][2] and self.board[0][0] != "-":
            return self.board[0][0]
        if self.board[0][2] == self.board[1][1] == self.board[2][0] and self.board[0][2] != "-":
            return self.board[0][2]
        # check for tie
        if "-" not in self.board[0] and "-" not in self.board[1] and "-" not in self.board[2]:
            return "TIE"
        # no winner no tie
        return None

    def get_move(self):
        print("You are using " + self.player)
        if self.player == "X":
            while True:
                row = int(input("Input Row: "))
                col = int(input("Input Column: "))
                if row < 0 or row >= len(self.board) or col < 0 or col >= len(self.board[0]):
                    print("out of Bounds")
                elif self.board[row][col] == "-":
                    self.board[row][col] = self.player
                    break
                else:
                    print("Someone is already in that spot!")
            
            # 玩家落子后立即检查是否获胜
            winner = self.check_winner()
            if winner:
                return winner

            print("Player O (computer) is making a move...")
            row, col = random.randint(0, 2), random.randint(0, 2)
            while self.board[row][col] != "-":
                row, col = random.randint(0, 2), random.randint(0, 2)
            print(f"Player O chooses ({row + 1},{col + 1})")
            self.board[row][col] = "O"

        elif self.player == "O":
            while True:
                row = int(input("Input Row: "))
                col = int(input("Input Column: "))
                if row < 0 or row >= len(self.board) or col < 0 or col >= len(self.board[0]):
                    print("out of Bounds")
                elif self.board[row][col] == "-":
                    self.board[row][col] = self.player
                    break
                else:
                    print("Someone is already in that spot!")
            
            # 玩家落子后立即检查是否获胜
            winner = self.check_winner()
            if winner:
                return winner

            print("Player X (computer) is making a move...")
            row, col = random.randint(0, 2), random.randint(0, 2)
            while self.board[row][col] != "-":
                row, col = random.randint(0, 2), random.randint(0, 2)
            print(f"Player X chooses ({row + 1},{col + 1})")
            self.board[row][col] = "X"
        
        # 电脑落子后检查胜负
        return self.check_winner()

    def play_game(self):
        self.player_choice()
        self.create_board()
        while True:
            self.print_board()
            result = self.get_move()
            if result:
                self.print_board()
                if result == "TIE":
                    print("It's a tie!")
                else:
                    print(f"Player {result} wins!")
                break


game = TicTacToe()
game.play_game()

关键修改说明 #

1. check_winner方法：将平局判断的print改为返回"TIE"，让调用方可以识别平局状态。
2. get_move方法：
   • 玩家落子后立即调用check_winner，若已有赢家则返回结果，跳过电脑落子步骤。
   • 电脑落子后也调用check_winner，返回当前的胜负状态。
3. play_game方法：接收get_move返回的结果，同时判断赢家和平局情况，终止游戏并打印对应提示。

内容的提问来源于stack exchange，提问作者Hellscythe