python - Pygame，按下一个键时正好执行 1 次命令，然后等待另一次单击

Question

if key("LEFT"):
    if select_x != 100:
        select_x-=64
    else:
        print("BORDER REACHED")

如果你运行程序并按下左键，pygame 将永远执行下面写的命令，直到你停止按下该键，我希望 pygame 只执行命令 1 次，然后等待下一次点击。

Answer 1

在事件循环中做事件处理 for event in pygame.event.get()::

import pygame as pg


pg.init()
screen = pg.display.set_mode((320, 240))
clock = pg.time.Clock()
select_x = 164
done = False

while not done:
    for event in pg.event.get():
        if event.type == pg.QUIT:
            done = True
        elif event.type == pg.KEYDOWN:
            if event.key == pg.K_LEFT:
                if select_x != 100:
                    select_x -= 64
                else:
                    print("BORDER REACHED")

    screen.fill((30, 30, 30))
    pg.display.flip()
    clock.tick(30)

pg.quit()