如何在一个列表中放置多个角色并让它们移动- python pygame

import pygame
import random

# 定义角色类
class Role:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.speed = 5

    def move(self):
        self.x += random.randint(-1, 1) * self.speed
        self.y += random.randint(-1, 1) * self.speed

# 初始化 Pygame
pygame.init()

# 设置游戏窗口
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Multiple Roles Movement")

# 创建角色列表
roles = []
num_roles = 5

for _ in range(num_roles):
    x = random.randint(0, screen_width)
    y = random.randint(0, screen_height)
    role = Role(x, y)
    roles.append(role)

# 游戏循环
running = True
clock = pygame.time.Clock()

while running:
    screen.fill((0, 0, 0))

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

    # 更新角色位置
    for role in roles:
        role.move()

    # 绘制角色
    for role in roles:
        pygame.draw.circle(screen, (255, 255, 255), (role.x, role.y), 10)

    pygame.display.update()
    clock.tick(60)

# 退出游戏
pygame.quit()