Python - TicTacToe错误

Question

所以这是我的tic tac toe python游戏，但结果是在有人获胜后，你必须在结束之前选择另一个方格，当它结束时，它永远不会显示'玩家一赢！'或者'玩家二赢了！'我不确定为什么会这样。有人可以帮忙吗？

# Tic Tac Toe Game
import time
import sys
who = 'p1'
finished = 'no'
board = [0,1,2,
         3,4,5,
         6,7,8]

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

def checkWin():
    if board[0] == 'x' and board[3] == 'x' and board[6] == 'x':
        finished = 'yes'
        return True
    elif board[0] == 'y' and board[3] == 'y' and board[6] == 'y':
        finished = 'yes'
        return True
    elif board[1] == 'x' and board[4] == 'x' and board[7] == 'x':
        finished = 'yes'
        return True
    elif board[1] == 'y' and board[4] == 'y' and board[7] == 'y':
        finished = 'yes'
        return True
    elif board[2] == 'y' and board[5] == 'y' and board[8] == 'y':
        finished = 'yes'
        return True
    elif board[2] == 'x' and board[5] == 'x' and board[8] == 'x':
        finished = 'yes'
        return True
    elif board[0] == 'y' and board[1] == 'y' and board[2] == 'y':
        finished = 'yes'
        return True
    elif board[0] == 'x' and board[1] == 'x' and board[2] == 'x':
        finished = 'yes'
        return True
    elif board[3] == 'x' and board[4] == 'x' and board[5] == 'x':
        finished = 'yes'
        return True
    elif board[3] == 'y' and board[4] == 'y' and board[5] == 'y':
        finished = 'yes'
        return True
    elif board[6] == 'y' and board[7] == 'y' and board[8] == 'y':
        finished = 'yes'
        return True
    elif board[6] == 'x' and board[7] == 'x' and board[8] == 'x':
        finished = 'yes'
        return True
    elif board[0] == 'x' and board[4] == 'x' and board[8] == 'x':
        finished = 'yes'
        return True
    elif board[0] == 'y' and board[4] == 'y' and board[8] == 'y':
        finished = 'yes'
        return True
    elif board[2] == 'y' and board[4] == 'y' and board[6] == 'y':
        finished = 'yes'
        return True
    elif board[2] == 'x' and board[4] == 'x' and board[6] == 'x':
        finished = 'yes'
        return True
    else:
        return False

print ('Welcome to a two-player Tic.Tac.Toe Game!')
time.sleep(2)
print ("Just pick a spot to put your mark!")
time.sleep(1.5)
print ('Now, start!')
time.sleep(0.2)
print (show())

while checkWin() == False:
    while who == 'p1':
        try:
            p1 = int(input('Player 1, select a spot: '))

            if board[p1] != 'x' and board[p1] != 'o':
                board[p1] = 'x'
                who = 'p2'
                break

            else:
                print ('This spot is taken.')
                pass

        except (ValueError, IndexError):
            print ('That is not available. Please try again.')

    print (show())
    while who == 'p2':
        try:
            p2 = int(input('Player 2, select a spot: '))

            if board[p2] != 'x' and board[p2] != 'o':
                board[p2] = 'o'
                who = 'p1'
                break

            else:
                print ('This spot is taken.')
                pass

        except (ValueError, IndexError):
            print ('That is not available. Please try again.')

    print (show())
while checkWin == True:
    # x
    if board[0] == 'x' and board[3] == 'x' and board[6] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[1] == 'x' and board[4] == 'x' and board[7] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[2] == 'x' and board[5] == 'x' and board[8] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[0] == 'x' and board[1] == 'x' and board[2] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[3] == 'x' and board[4] == 'x' and board[5] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[6] == 'x' and board[7] == 'x' and board[8] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[0] == 'x' and board[4] == 'x' and board[8] == 'x':
        print ('Player 1 won!')
        sys.exit()
    elif board[2] == 'x' and board[4] == 'x' and board[6] == 'x':
        print ('Player 1 won!')
        sys.exit()
    # y
    else:
        print ('Player 2 won!')
        sys.exit()