Игра "Крестики-нолики"

from tkinter import *
import random, time
 
def stop_game():
    global game_left
    for item in game_left:
        buttons[item].config(bg="thistle1", state="disabled")
 
def win(n):
    global game
    if (game[0] == n and game[1] == n and game[2] == n) or (game[3] == n and game[4] == n and game[5] == n) or (game[6] == n and game[7] == n and game[8] == n) \
            or (game[0] == n and game[3] == n and game[6] == n) or (game[1] == n and game[4] == n and game[7] == n) or (game[2] == n and game[5] == n and game[8] == n)\
            or (game[0] == n and game[4] == n and game[8] == n) or (game[2] == n and game[4] == n and game[6] == n):
        return True
 
def push(b):
    global game
    global game_left
    global turn
    game[b] = "X"
    buttons[b].config(text="X", bg="thistle1", state="disabled")
    game_left.remove(b)  # "выбрасываем" ход b
 
    if b == 4 and turn == 0:
        t = random.choice(game_left)
    elif b != 4 and turn == 0:
        t = 4
    if turn > 0:
        t = 8 - b
    if t not in game_left:
        try:
            t = random.choice(game_left)
        except IndexError:
            label["text"] = "Ничья!"
            stop_game()
 
    game[t] = "0"
    time.sleep(0.5)
    buttons[t].config(text="0", bg="thistle1", state="disabled")
 
    if win("X"):
        label["text"] = "Вы победили!"
        stop_game()
    elif win("0"):
        label["text"] = "Вы проиграли"
        stop_game()
    else:
        if (len(game_left)>1):
            game_left.remove(t)
        else:
            label["text"] = "Ничья!"
            stop_game()
        turn += 1
def new_game():
    global game
    global game_left
    global turn
    game = [None] * 9
    game_left = list(range(9))
    turn = 0
    label["text"] = "Игра крестики-нолики"
    for button in buttons:
        button.config(text="", bg="SystemButtonFace", state="normal")
 
game = [None] * 9 #Данные о ходах (где крестики, где нолики)
game_left = list(range(9)) #используем список, чтобы понимать, какие ячейки остались в игре
turn = 0
 
root = Tk()
label = Label(width=20, text="Игра крестики-нолики", font=("Arial", 20, "bold"))
buttons = [Button(width=9, height=3, font=("Arial", 28, "bold"), bg = "white", command=lambda x=i: push(x)) for i in range(9)] #Экземпляр класса Button
 
label.grid(row=0, column=0, columnspan=3)
row = 1
col = 0
for i in range(9):
    buttons[i].grid(row=row, column=col)
    col += 1
    if col == 3:
        row += 1
        col = 0
 
new_game_button = Button(text="Новая игра", font=("Arial", 14), command=new_game)
new_game_button.grid(row=row, columnspan=3)
root.mainloop()