Tic，Tac，Toe - 结束游戏错误

Question

感谢您的评论。

我现在解决了原来的问题，如果一名玩家获胜并且选择不继续游戏，游戏就会正确结束。

但是，我现在已经尝试添加游戏是否是平局，这似乎不起作用。

我已经定义了一个函数来检查是否有任何有效的移动，如果没有，它应该返回相应的值来停止游戏并打印到屏幕上有一个平局。

它认识到没有人赢过但没有触发抽签回应。

def start():
    choices = [" "," "," "," "," "," "," "," "," "]
    initialboard=["1","2","3","4","5","6","7","8","9"]
    board(initialboard)
    getchoice(choices)

def board(choices):
    print("+---+---+---+")
    print("+ "+choices[0]+" + "+choices[1]+" + "+choices[2]+" +")
    print("+---+---+---+")
    print("+ "+choices[3]+" + "+choices[4]+" + "+choices[5]+" +")
    print("+---+---+---+")
    print("+ "+choices[6]+" + "+choices[7]+" + "+choices[8]+" +")
    print("+---+---+---+")


def getchoice(choices):
    while checkwin(choices)==0:  
        userchoice = int(input ("Where would you like to put your X?"))
        index = userchoice-1
        while choices[index]!=" ":
            userchoice = int(input ("That space is taken. Where would you like to put your X?"))
            index = userchoice-1    
        choices[index]="X"
        board(choices)

        if checkwin(choices)!=1:
            userchoice = int(input ("Where would you like to put your O?"))
            index = userchoice-1
            while choices[index]!=" ":
                userchoice = int(input ("That space is taken. Where would you like to put your O?"))
                index = userchoice-1           
            choices[index]="O"
            board(choices)
    if checkwin(choices)==1:
        print("Player 1 wins")
    elif checkwin(choices)==2:
        print("Player 2 wins")
    else:
        if checkwin(choices)==3:
            print("It's a draw")

    again = input("Would you like to play again? Y/N")
    again = again.upper()
    if again == "Y":
        start()
    else:
        print("Thank you for playing")

def draw(c):
    for i in range(0,8):
        if c[i] ==" ":
            return True
    return False

def checkwin (c):

    if ((c[0]=="X" and c[1]=="X" and c[2]=="X") or
(c[3]=="X"and c[4]=="X" and c[5] =="X") or
(c[6]=="X"and c[7]=="X" and c[8] =="X") or
(c[0]=="X"and c[3]=="X" and c[6] =="X" )or
(c[1]=="X"and c[4]=="X" and c[7] =="X") or
(c[2]=="X"and c[5]=="X" and c[8] =="X") or
(c[0]=="X"and c[4]=="X" and c[8] =="X") or
(c[6]=="X"and c[4]=="X" and c[2] =="X"))==True:
        return 1

    elif ((c[0]=="O" and c[1]=="O" and c[2]=="O") or
(c[3]=="O"and c[4]=="O" and c[5] =="O") or
(c[6]=="O"and c[7]=="O" and c[8] =="O") or
(c[0]=="O"and c[3]=="O" and c[6] =="O" )or
(c[1]=="O"and c[4]=="O" and c[7] =="O") or
(c[2]=="O"and c[5]=="O" and c[8] =="O") or
(c[0]=="O"and c[4]=="O" and c[8] =="O") or
(c[6]=="O"and c[4]=="O" and c[2] =="O")) ==True:
        return 2

    elif draw(c)==False:
        print("DRAW")
        return 3
    else:
        return 0

start()