code for tic tac toe

def valid(lis):
    while True:
        x=input()
        if not x in lis:
            print('Enter a valid choice...')
            continue
        else:
            break
    return x
def display(board):
    print(board[1] + '|' + board[2] + '|' + board[3])
    print(board[4] + '|' + board[5] + '|' + board[6])
    print(board[7] + '|' + board[8] + '|' + board[9])
def start(s):
    return s=='yes'
def check(board):
    t=False
    for i in range(1,8,3):
        if board[i]==board[i+1]==board[i+2]!=' ':
            t=True
    for i in range(1,4):
        if board[i]==board[i+3]==board[i+6]!=' ':
            t=True
    if board[1]==board[5]==board[9]!=' ':
        t =  True
    if board[3]==board[5]==board[7]!=' ':
        t = True
    return t

def play(board,f,x):
    if f==0:
        while True:
            n = int(input(f'Enter the place where Player1 want to insert {x} '))
            if (not n in range(1,10)) or board[n]!=' ':
                print('This place is not empty or invalid')
                continue
            else:
                break
        board[n]=x
    else:
        while True:
            n = int(input(f'Enter the place where Player2 want to insert {y} '))
            if (not n in range(1,10)) or board[n]!=' ':
                print('This place is not empty')
                continue
            else:
                break
        board[n]=y
    return check(board)





print('Welcome to the tic tac toe game')
s = 'yes'
YN = ['yes','no']
while(start(s)):
    XO = ['X','O']
    print('What do Player 1 want to choose X or O?  ')
    x=valid(XO)
    if x=='X':
        y='O'
    else:
        y='X'
    board=['#',' ',' ',' ',' ',' ',' ',' ',' ',' ']
    display((board))
    f=0
    cnt=0
    while cnt<9:
        val = play(board,f,x)
        display(board)
        if val:
            print(f'Congratulations !!! Player {f+1} has won the match')
            break
        f=1-f
        cnt+=1
    if cnt==9:
        print('Game tie :( ')

    print('Do you want to play the game? yes or no  ')
    s = valid(YN)
print('Thanks for Playing, hope you enjoyed it!!')