为什么我的方块不动？我垃圾邮件的箭头键，但代码没有给出错误，只是没有工作的方式，它的意图

Question

当我垃圾邮件的箭头键，没有任何工作，我的广场不会动摇。这是一个python课程的家庭作业，我真的需要帮助，所以谁知道为什么？如果是，请告诉我。。。请

    import pygame
    pygame.init()
    scrlengthX = 640
    scrlengthY = 480
    b = 20

    x = (scrlengthX-b)/2
    y = (scrlengthY-b)/2
    r = pygame.Rect(x,y,b,b)
    #this explains where the square is supposed to be
    while True:
        screen = pygame.display.set_mode([scrlengthX,scrlengthY])
        # size of the screen
        def draw():

            screen.fill([0,0,255])

            r = pygame.Rect(x,y,b,b)


            pygame.draw.rect(screen,(0,0,0), r)
            pygame.display.flip()

        a = 1
        while a == 1:
            draw()
                e = pygame.event.get(pygame.QUIT)
            print(e)
            if len(e) > 0:
                pygame.quit()

        k = pygame.event.get(pygame.KEYDOWN)
        for i in k:
            if i.key == pygame.K_UP:
                y = y-5
            if i.key == pygame.K_DOWN:
                y = y+5
            if i.key == pygame.K_LEFT:
                x = x-5
            if i.key == pygame.K_RIGHT:
                x = x+5
            # button detecting, but it does not work :(
            # this is where everything goes wrong, anybody help?

    pygame.quit()

Answer 1

试试这个微妙的变化：

k = pygame.event.get()
for i in k:
    if i.type == pygame.KEYDOWN:
        if i.key == pygame.K_UP:
            y -= 5
        if i.key == pygame.K_DOWN:
            y += 5
        if i.key == pygame.K_LEFT:
            x -= 5
        if i.key == pygame.K_RIGHT:
            x += 5