Kostik Iln - Close and Open Window

import sys, time, keyboard
import pygame
from pygame.locals import *
from pygame import Rect as R
from pygame import Vector2 as V
from random import randint

BLACK = (15, 56, 15)
WHITE = (139, 172, 15)

pygame.init()
PDR = R(0, 0, 720, 720)
PDS = pygame.display.set_mode(PDR.size) # primary display surface
SDS = PDS.copy() # secondary display surface
FPS = 120

window_closed = False

ball_pos = V(PDR.center)
ball_dir = V(1, 0).rotate(randint(0, 359))
ball_radius = 50

delta = time.perf_counter()

exit_demo = False
while not exit_demo:
    now = time.perf_counter()
    interval = (now - delta) * FPS
    delta = now

    for e in pygame.event.get():
        if e.type == KEYUP:
            if e.key == K_ESCAPE:
                exit_demo = True
            if e.key == K_SPACE:
                if not window_closed:
                    pygame.quit()
                    window_closed = True
    if window_closed:
        if keyboard.read_key() == "space":
            pygame.init()
            PDS = pygame.display.set_mode(PDR.size)
            # time.sleep(1)
            window_closed = False

    SDS.fill(BLACK)
    pygame.draw.circle(SDS, WHITE, ball_pos, ball_radius)

    if not window_closed:
        PDS.blit(SDS, (0, 0))
        pygame.display.update()

    ball_pos += ball_dir * interval
    if ball_pos.x > PDR.right - ball_radius:
        ball_pos.x = PDR.right - ball_radius
        ball_dir.x = -ball_dir.x
    if ball_pos.x < ball_radius:
        ball_pos.x = ball_radius
        ball_dir.x = -ball_dir.x
    if ball_pos.y > PDR.bottom - ball_radius:
        ball_pos.y = PDR.bottom - ball_radius
        ball_dir.y = -ball_dir.y
    if ball_pos.y < ball_radius:
        ball_pos.y = ball_radius
        ball_dir.y = -ball_dir.y