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

import pygame
pygame.init()

screen = pygame.display.set_mode((500, 500))
clock = pygame.time.Clock()
x, y = 50, 250
speed = 5

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    x += speed
    if x > 450 or x < 50:
        speed = -speed

    screen.fill((0, 0, 0))
    pygame.draw.circle(screen, (255, 0, 0), (x, y), 30)
    pygame.display.flip()
    clock.tick(60)

pygame.quit()