square = ['o', '1', '2', '3', '4', '5', '6', '7', '8', '9']
player = 2
playername = None
mark = None
do = True

def checkwin():
    if (square[1] == square[2] & square[2] == square[3]):
        do = False
    elif (square[4] == square[5] & square[5] == square[6]):
        do = False
    elif (square[7] == square[8] & square[8] == square[9]):
        do = False
    elif (square[1] == square[4] & square[4] == square[7]):
        do = False
    elif (square[2] == square[5] & square[5] == square[8]):
        do = False
    elif (square[3] == square[6] & square[6] == square[9]):
        do = False
    elif (square[1] == square[5] & square[5] == square[9]):
        do = False
    elif (square[3] == square[5] & square[5] == square[7]):
        do = False
    else:
        do = True


def board():
    print("-------------")
    print("| " + square[1] + " | " + square[2] + " | " + square[3] + " |")
    print("-------------")
    print("| " + square[4] + " | " + square[5] + " | " + square[6] + " |")
    print("-------------")
    print("| " + square[7] + " | " + square[8] + " | " + square[9] + " |")
    print("-------------")



board()

while (do == True):
    if (player == 1):
        player = 2
    elif (player == 2):
        player = 1


    if (player == 1):
        playername = "Player 1"
    elif (player == 2):
        playername = "Player 2"


    if (player == 1):
        mark = "X"
    elif (player == 2):
        mark = "O"


    answer = int(input(playername + " please choose a square: "))

    if (answer == 1):
        square[1] = mark
    elif (answer == 2):
        square[2] = mark
    elif (answer == 3):
        square[3] = mark
    elif (answer == 4):
        square[4] = mark
    elif (answer == 5):
        square[5] = mark
    elif (answer == 6):
        square[6] = mark
    elif (answer == 7):
        square[7] = mark
    elif (answer == 8):
        square[8] = mark
    elif (answer == 9):
        square[9] = mark

    board()
    checkwin()


print(playername + "is the winner!")
exit()