Tic Tac Toe game in python

//TIC TAC TOE GAME IN PYTHON

def sum(a,b,c):
    return a+b+c
def printBoard(xstate,zstate):
    
    print('X' if xstate[0] else('O' if zstate[0] else 0), "|" ,
          'X' if xstate[1] else('O' if zstate[1] else 1), "|", 
         'X' if xstate[2] else('O' if zstate[2] else 2))
    print('--|---|---')
    print('X' if xstate[3] else('O' if zstate[3] else 3), "|" ,
          'X' if xstate[4] else('O' if zstate[4] else 4), "|", 
         'X' if xstate[5] else('O' if zstate[5] else 5))
    print('--|---|---')
    print('X' if xstate[6] else('O' if zstate[6] else 6), "|" ,
          'X' if xstate[7] else('O' if zstate[7] else 7), "|", 
         'X' if xstate[8] else('O' if zstate[8] else 8))

def checkwin(xstate,zstate):
    wins = [[0,1,2],[3,4,5],[6,7,8],[0,3,6],[1,4,7],[2,5,8],[0,4,8],[2,4,6]]

    for win in wins:
        if(sum(xstate[win[0]],xstate[win[1]],xstate[win[2]])==3):
            print('\n======> X WON MATCH <=====')
            return 1;
        if(sum(zstate[win[0]],zstate[win[1]],zstate[win[2]])==3):
            print('\n=====> 0 WON MATCH <=====')
            return 0;
    return -1

if __name__ == "__main__":
    xstate = [0,0,0,0,0,0,0,0,0]
    zstate = [0,0,0,0,0,0,0,0,0]
    turn = 1
    print('WELCOME TO ---- TIC TAC TOE ----')
    while(True):
        printBoard(xstate,zstate)
        if(turn == 1):
            print("x's chance")
            value = int(input("Please enter a value : "))
            xstate[value]=1
        else :
            print("0's chance")
            value = int(input("Please enter a value : "))
            zstate[value]=1

        cwin = checkwin(xstate,zstate)
        if(cwin!=-1):
            print("\n-----MATCH OVER-----")
            break;
        turn = 1-turn