在pygame中移动彗星

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Moving Comet")

comet_x = 400
comet_y = 300
comet_speed = 1

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    # 清空屏幕
    screen.fill((0, 0, 0))

    # 更新彗星位置
    comet_x += comet_speed

    # 绘制彗星
    pygame.draw.circle(screen, (255, 255, 255), (comet_x, comet_y), 10)

    # 更新屏幕显示
    pygame.display.flip()