VolviX

from os import system #to clear the screen
from random import randint #to generate random number


def player_mark(mark): #selection of the marks
    while True:
        mark = input("Player 1 choose your mark (X/O): ")
        if mark == "X" or mark == "x" or mark == "O" or mark == "o":
            mark = mark.upper()
            if mark == "X":