用Python写一个井字棋程序

以下是一个简单的井字棋程序的Python代码：

def display_board(board):
    print(board[0] + '|' + board[1] + '|' + board[2])
    print('-+-+-')
    print(board[3] + '|' + board[4] + '|' + board[5])
    print('-+-+-')
    print(board[6] + '|' + board[7] + '|' + board[8])

def check_winner(board):
    if board[0] == board[1] == board[2] != ' ':
        return True
    elif board[3] == board[4] == board[5] != ' ':
        return True
    elif board[6] == board[7] == board[8] != ' ':
        return True
    elif board[0] == board[3] == board[6] != ' ':
        return True
    elif board[1] == board[4] == board[7] != ' ':
        return True
    elif board[2] == board[5] == board[8] != ' ':
        return True
    elif board[0] == board[4] == board[8] != ' ':
        return True
    elif board[2] == board[4] == board[6] != ' ':
        return True
    else:
        return False

def main():
    board = [' '] * 9
    player = 'X'
    while True:
        display_board(board)
        move = int(input('Player ' + player + ', enter your move (0-8): '))
        if board[move] != ' ':
            print('Invalid move. Try again.')
            continue
        board[move] = player
        if check_winner(board):
            display_board(board)
            print('Player ' + player + ' wins!')
            break
        if ' ' not in board:
            display_board(board)
            print('It is a tie!')
            break
        player = 'O' if player == 'X' else 'X'

if __name__ == '__main__':
    main()

程序使用一个列表来表示井字棋的棋盘，其中每个元素代表一个格子，初始时都是空格。程序通过循环来交替让两个玩家下棋，每次下棋后检查是否有玩家获胜或平局。如果有获胜者，程序输出获胜者的信息并结束游戏；如果是平局，程序输出平局信息并结束游戏。如果没有获胜者或平局，则继续下一轮。