Как сделать, чтобы после окончания игры, код начался заново

[AnondU]

import pygame
import random
pygame.init()
def draw_grid(scr):
pygame.draw.line(scr, (0, 0, 0), (100, 0), (100, 300), 3)
pygame.draw.line(scr, (0, 0, 0), (200, 0), (200, 300), 3)
pygame.draw.line(scr, (0, 0, 0), (0, 100), (300, 100), 3)
pygame.draw.line(scr, (0, 0, 0), (0, 200), (300, 200), 3)

def draw_tic_tac_toe(scr, items):
for i in range(3):
for j in range(3):
if items[j] == "0":
pygame.draw.circle(scr, (255, 0, 0), (j * 100 + 50, i * 100 + 50), 45)
elif items[j] == "x":
pygame.draw.line(scr, (0, 0, 255), (j * 100 + 5, i * 100 + 5), (j * 100 + 95, i * 100 + 95), 3)
pygame.draw.line(scr, (0, 0, 255), (j * 100 + 95, i * 100 + 5), (j * 100 + 5, i * 100 + 95), 3)

def get_win_check(fd, symbol):
flag_win = False
for line in fd:
if line.count(symbol) == 3:
flag_win = True
for i in range(3):
if fd[0] == fd[1] == fd[2] == symbol:
flag_win = True
if fd[0][0] == fd[1][1] == fd[2][2] == symbol:
flag_win = True
if fd[0][2] == fd[1][1] == fd[2][0] == symbol:
flag_win = True
return flag_win

SCREEN_SIZE = (300, 300)
window = pygame.display.set_mode(SCREEN_SIZE)
screen = pygame.Surface(SCREEN_SIZE)
pygame.display.set_caption("Крестики-нолики")
screen.fill((255, 255, 255))
field = [["", "", ""],
["", "", ""],
["", "", ""]]
mainloop = True
game_over = False
while mainloop:
for event in pygame.event.get():
if event.type == pygame.QUIT:
mainloop = False
if event.type == pygame.MOUSEBUTTONDOWN and not game_over:
pos = pygame.mouse.get_pos()
if field[pos[1] // 100][pos[0] // 100] == "":
field[pos[1] // 100][pos[0] // 100] = "x"
x, y = random.randint(0, 2), random.randint(0, 2)
while field[x][y] != "":
x, y = random.randint(0, 2), random.randint(0, 2)
field[x][y] = "0"
player_win = get_win_check(field, "x")
ai_win = get_win_check(field, "0")
if player_win or ai_win:
game_over = True
if player_win:
pygame.display.set_caption("Вы победили")
else:
pygame.display.set_caption("Компьютер победил")
elif field[0].count("x") + field[0].count("0") + field[1].count("x") + \
field[1].count("0") + field[2].count("x") + field[2].count("0") == 8:
game_over = True
pygame.display.set_caption("Ничья")
draw_tic_tac_toe(screen, field)
draw_grid(screen)
window.blit(screen, (0, 0))
pygame.display.update()

 

[regnor]

как задать вопрос