main.py

board = [' ' for x in range(9)]  
  
def print_board():  
    row1 = '| {} | {} | {} |'.format(board[0], board[1], board[2])  
    row2 = '| {} | {} | {} |'.format(board[3], board[4], board[5])  
    row3 = '| {} | {} | {} |'.format(board[6], board[7], board[8])  
    print()  
    print(row1)  
    print(row2)  
    print(row3)  
    print()  
  
def player_move(icon):  
    if icon == 'X':  
        number = 1  
    elif icon == 'O':  
        number = 2  
    print('Your turn player {}'.format(number))  
    choice = int(input('Enter your move (1-9): ').strip())  
    if board[choice - 1] == ' ':  
        board[choice - 1] = icon  
    else:  
        print()  
        print('That space is taken!')  
  
def is_victory(icon):  
    if (board[0] == icon and board[1] == icon and board[2] == icon) or  (board[3] == icon and board[4] == icon and board[5] == icon) or   (board[6] == icon and board[7] == icon and board[8] == icon) or  (board[0] == icon and board[3] == icon and board[6] == icon) or   (board[1] == icon and board[4] == icon and board[7] == icon) or   (board[2] == icon and board[5] == icon and board[8] == icon) or  (board[0] == icon and board[4] == icon and board[8] == icon) or   (board[2] == icon and board[4] == icon and board[6] == icon) :
        return True  
    else:  
        return False  
  
def is_draw():  
    if ' ' not in board:  
        return True  
    else:  
        return False  
  
while True:  
    print_board()  
    player_move('X')  
    print_board()  
    if is_victory('X'):  
        print('X Wins! Congratulations!')  
        break  
    elif is_draw():  
        print('The game is a draw!')  
        break  
    player_move('O')  
    if is_victory('O'):  
        print_board()  
        print('O Wins! Congratulations!')  
        break  
    elif is_draw():  
        print('The game is a draw!')  
        break