Отправка событий через pygame.event.post()

import pygame
from os import environ
from random import randint
from pygame._sdl2.video import Window
 
def get_color():
    return [randint(1,10)*25 for _ in range(3)]
 
XPOS,YPOS = 100,100
WIDTH,HEIGHT = 400,400
 
environ['SDL_VIDEO_WINDOW_POS'] ="%d,%d" % (XPOS,YPOS)
pygame.display.init()
screen = pygame.display.set_mode((WIDTH,HEIGHT),pygame.NOFRAME)
#screen = pygame.display.set_mode((WIDTH,HEIGHT))
clock = pygame.time.Clock()
r = 1
v = 1
pos = 100,100
color = get_color()    
back_color = get_color()
dx,dy = 0,0
run = True
while run:
    clock.tick(25)
    screen.fill(back_color)
    pygame.draw.circle(screen, color, pos, r)
    pygame.display.update()
    r += v 
    if r < 1 or r > 100: v *= -1
    for event in pygame.event.get():
        if event.type == pygame.QUIT: 
            run = False
            break
        if event.type == pygame.KEYDOWN:
            if event.key == 27: 
                run = False
                break
        if event.type == pygame.MOUSEBUTTONDOWN:
            pos = event.pos
            color = get_color()
            back_color = get_color()
        if event.type == pygame.USEREVENT: 
            d  = event.dict
            if 'v' in d: v = d['v']
            if 'move' in d:
                window = Window.from_display_module()
                window.position = d['move']
pygame.quit()
print('game quit')
exit()