修改TicTacToe程序，补充“判断游戏结束”部分代码。

好的，我可以帮你修改TicTacToe程序并补充判断游戏结束的代码。在TicTacToe游戏中，判断游戏结束的条件通常有以下几种：

1. 棋盘填满，平局结束
2. 一方获胜，游戏结束
3. 玩家选择退出游戏

下面是修改后的TicTacToe程序，包含了判断游戏结束的代码：

import random

# 初始化棋盘
board = [' '] * 10

# 随机决定玩家先手或电脑先手
def choose_first():
    if random.randint(0, 1) == 0:
        return 'computer'
    else:
        return 'player'

# 打印棋盘
def display_board(board):
    print('   |   |')
    print(' ' + board[7] + ' | ' + board[8] + ' | ' + board[9])
    print('   |   |')
    print('-----------')
    print('   |   |')
    print(' ' + board[4] + ' | ' + board[5] + ' | ' + board[6])
    print('   |   |')
    print('-----------')
    print('   |   |')
    print(' ' + board[1] + ' | ' + board[2] + ' | ' + board[3])
    print('   |   |')

# 玩家选择棋子位置
def player_choice(board):
    position = 0
    while position not in range(1, 10) or not space_check(board, position):
        try:
            position = int(input('请选择你要下棋的位置(1-9): '))
        except ValueError:
            print('输入错误，请重新选择。')
    return position

# 判断棋盘是否还有空位
def full_board_check(board):
    return ' ' not in board[1:]

# 判断棋子位置是否可用
def space_check(board, position):
    return board[position] == ' '

# 在棋盘上放置棋子
def place_marker(board, marker, position):
    board[position] = marker

# 判断是否有一方获胜
def win_check(board, mark):
    return ((board[7] == mark and board[8] == mark and board[9] == mark) or
    (board[4] == mark and board[5] == mark and board[6] == mark) or
    (board[1] == mark and board[2] == mark and board[3] == mark) or
    (board[7] == mark and board[4] == mark and board[1] == mark) or
    (board[8] == mark and board[5] == mark and board[2] == mark) or
    (board[9] == mark and board[6] == mark and board[3] == mark) or
    (board[7] == mark and board[5] == mark and board[3] == mark) or
    (board[9] == mark and board[5] == mark and board[1] == mark))

# 主游戏流程
print('欢迎来到井字棋游戏！')
while True:
    # 初始化棋盘
    board = [' '] * 10
    player_marker = ''
    computer_marker = ''
    game_on = True

    # 玩家选择棋子
    while player_marker not in ['X', 'O']:
        player_marker = input('请选择你要使用的棋子（X或O）：').upper()

    # 设置电脑使用的棋子
    if player_marker == 'X':
        computer_marker = 'O'
    else:
        computer_marker = 'X'

    turn = choose_first()
    print(turn + ' 先手。')

    while game_on:
        if turn == 'player':
            # 玩家回合
            display_board(board)
            position = player_choice(board)
            place_marker(board, player_marker, position)

            # 判断是否获胜
            if win_check(board, player_marker):
                display_board(board)
                print('恭喜你，你获胜了！')
                game_on = False
            else:
                # 判断是否平局
                if full_board_check(board):
                    display_board(board)
                    print('平局！')
                    break
                else:
                    turn = 'computer'
        else:
            # 电脑回合
            display_board(board)
            position = random.randint(1, 9)

            # 随机选择棋子位置
            while not space_check(board, position):
                position = random.randint(1, 9)

            place_marker(board, computer_marker, position)

            # 判断是否获胜
            if win_check(board, computer_marker):
                display_board(board)
                print('很遗憾，你输了。')
                game_on = False
            else:
                # 判断是否平局
                if full_board_check(board):
                    display_board(board)
                    print('平局！')
                    break
                else:
                    turn = 'player'

    # 询问是否继续游戏
    if input('是否继续游戏(Y/N)?').lower() != 'y':
        break

在主游戏流程中，添加了游戏结束的判断，如果游戏结束，会提示玩家输赢或者平局，并询问是否继续游戏。