如何在python中将sprites设置为矩阵中的数字

import pygame

pygame.init()

window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))
sprites_group = pygame.sprite.Group()

class NumberSprite(pygame.sprite.Sprite):
    def __init__(self, number):
        super().__init__()
        self.number = number
        self.image = pygame.Surface((50, 50))  # 设置精灵的大小
        self.rect = self.image.get_rect()

    def draw(self):
        self.image.fill((255, 255, 255))  # 设置精灵的颜色
        font = pygame.font.Font(None, 36)  # 设置字体和大小
        text = font.render(str(self.number), True, (0, 0, 0))  # 渲染数字文本
        text_rect = text.get_rect(center=self.rect.center)
        self.image.blit(text, text_rect)  # 将数字文本绘制到精灵上

matrix = [[1, 2, 3],
          [4, 5, 6],
          [7, 8, 9]]

for i in range(len(matrix)):
    for j in range(len(matrix[i])):
        number = matrix[i][j]
        sprite = NumberSprite(number)
        sprite.rect.x = j * 60  # 设置精灵的横坐标
        sprite.rect.y = i * 60  # 设置精灵的纵坐标
        sprites_group.add(sprite)  # 将精灵添加到精灵组中

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

    sprites_group.update()  # 更新精灵状态
    window.fill((0, 0, 0))  # 清空窗口
    sprites_group.draw(window)  # 绘制精灵到窗口上
    pygame.display.flip()  # 更新窗口显示

pygame.quit()