Python 3.x 按下按钮使其不断移动

我按照一个在线教程制作了一个蛇游戏，希望得到一些帮助来进行一些修改。现在，按住向左或向右箭头键将导致蛇移动。只需轻触按钮就可以让蛇向左或向右移动，这样用户就不必按住箭头键了吗

question = True
while not gameExit:

    #Movement
    for event in pygame.event.get():   
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                direction = "left"
                start_x_change = -block_size_mov 
                start_y_change = 0                                                             
            elif event.key == pygame.K_RIGHT:
                leftMov = False
                direction = "right"
                start_x_change = block_size_mov 
                start_y_change = 0

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解决方案是首先存储精灵的x、y坐标，在按键上设置修改器（增加或减少数量），然后在循环时将修改器添加到坐标中。我已经编写了这样一个系统的快速演示：

import pygame
from pygame.locals import *

pygame.init()
# Set up the screen
screen = pygame.display.set_mode((500,500), 0, 32)
# Make a simple white square sprite
player = pygame.Surface([20,20])
player.fill((255,255,255))

# Sprite coordinates start at the centre
x = y = 250
# Set movement factors to 0
movement_x = movement_y = 0

while True:
    screen.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == KEYDOWN:
            if event.key == K_LEFT:
                movement_x = -0.05
                movement_y = 0
            elif event.key == K_RIGHT:
                movement_x = 0.05
                movement_y = 0
            elif event.key == K_UP:
                movement_y = -0.05
                movement_x = 0
            elif event.key == K_DOWN:
                movement_y = 0.05
                movement_x = 0

    # Modify the x and y coordinates
    x += movement_x
    y += movement_y

    screen.blit(player, (x, y))
    pygame.display.update()

请注意，在更改y时，需要将x移动修改器重置为0，反之亦然-否则，最终会出现有趣的对角线移动

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对于蛇类游戏，您可能希望修改蛇的大小以及/而不是位置-但您应该能够使用相同的结构实现类似的效果。

稍后我将对其进行测试！