如何在pygame中让对象以随机模式移动？

import pygame
import random

pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Random Movement")

class Object(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.Surface((50, 50))
        self.image.fill((255, 0, 0))
        self.rect = self.image.get_rect()
        self.rect.center = (400, 300)
        self.speed = [random.randint(-3, 3), random.randint(-3, 3)]

object = Object()
all_sprites = pygame.sprite.Group()
all_sprites.add(object)

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

    object.rect.x += object.speed[0]
    object.rect.y += object.speed[1]

    if object.rect.left < 0 or object.rect.right > 800:
        object.speed[0] = -object.speed[0]
    if object.rect.top < 0 or object.rect.bottom > 600:
        object.speed[1] = -object.speed[1]

    screen.fill((255, 255, 255))
    all_sprites.draw(screen)
    pygame.display.flip()

pygame.quit()