如何使用Python在Snake游戏中改变方向但继续移动

import pygame
import sys

# 初始化游戏
pygame.init()

# 设置游戏窗口大小和标题
window_width, window_height = 800, 600
window = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption("Snake Game")

# 定义颜色
black = pygame.Color(0, 0, 0)
white = pygame.Color(255, 255, 255)
green = pygame.Color(0, 255, 0)

# 定义蛇的初始位置和移动速度
snake_position = [100, 50]
snake_body = [[100, 50], [90, 50], [80, 50]]
direction = "RIGHT"
change_to = direction
snake_speed = 10

# 定义游戏时钟
clock = pygame.time.Clock()

# 定义游戏结束函数
def game_over():
    pygame.quit()
    sys.exit()

# 游戏主循环
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                change_to = "RIGHT"
            if event.key == pygame.K_LEFT:
                change_to = "LEFT"
            if event.key == pygame.K_UP:
                change_to = "UP"
            if event.key == pygame.K_DOWN:
                change_to = "DOWN"

    # 根据方向改变蛇的移动位置
    if change_to == "RIGHT" and direction != "LEFT":
        direction = "RIGHT"
    if change_to == "LEFT" and direction != "RIGHT":
        direction = "LEFT"
    if change_to == "UP" and direction != "DOWN":
        direction = "UP"
    if change_to == "DOWN" and direction != "UP":
        direction = "DOWN"

    if direction == "RIGHT":
        snake_position[0] += 10
    if direction == "LEFT":
        snake_position[0] -= 10
    if direction == "UP":
        snake_position[1] -= 10
    if direction == "DOWN":
        snake_position[1] += 10

    # 更新蛇的身体
    snake_body.insert(0, list(snake_position))
    if snake_position[0] == food_position[0] and snake_position[1] == food_position[1]:
        score += 1
        food_spawn = False
    else:
        snake_body.pop()

    # 绘制游戏窗口
    window.fill(black)
    for pos in snake_body:
        pygame.draw.rect(window, green, pygame.Rect(pos[0], pos[1], 10, 10))

    # 更新游戏显示
    pygame.display.flip()

    # 控制游戏速度
    clock.tick(snake_speed)