python井字棋盘理解

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#定义一个字典作为棋盘坐标
theBoard = {'top-L': ' ', 'top-M': ' ', 'top-R': ' ',
            'mid-L': ' ','mid-M': '', 'mid-R': ' ',
            'low-L': ' ', 'low-M': ' ', 'low-R': ' '}
#定义一个函数，传进去一个参数，作为初始棋盘
def printBoard(board):
    print(board['top-L'] + '|' + board['top-M'] + '|' + board['top-R'])
    print('-+-+-')
    print(board['mid-L'] + '|' + board['mid-M'] + '|' + board['mid-R'])
    print('-+-+-')
    print(board['low-L'] + '|' + board['low-M'] + '|' + board['low-R'])
turn = 'X'
#定义初始变量
for i in range(9):#循环8次
    printBoard(theBoard)#打印棋盘
    print('Turn for ' + turn + '. Move on which space?')#询问是否输入
    move = input()# 移动到哪里，输入棋盘坐标
    theBoard[move] = turn #更改修改的坐标值
    if turn == 'X': #改变旗手为O
        turn = 'O'
    else:
        turn = 'X'
printBoard(theBoard)#打印最终结果