要想实现键盘控制作用，就需要给游戏键盘监听事件
利用pygame模块的key.get_pressed()方法，来检测按键是否按下

key_press =pygame.key.get_pressed()if not key_press[K_UP] and ball.rect.bottom < height:ball.movedown()elif key_press[K_UP] and ball.rect.top>0:ball.moveup()

实现效果

游戏中，当按下上键时游戏对象就往上移动，一松开按键，游戏对象就往下降

完整代码

import pygame
from pygame.locals import *
from sys import exitpygame.init()                                     #进行初始化
bgsize = width,height = 1000,600
pygame.display.set_mode(bgsize)
pygame.display.set_caption('进击的蜘蛛')
bg=(0,0,0)                                       #设置背景颜色
turtl = pygame.image.load('D:\QQ\MobileFile/spride.png')
ball_image = pygame.transform.scale(turtl,(width//10,height//10))                               #对图片进行缩放
screen = pygame.display.get_surface()
class Ball(pygame.sprite.Sprite):def __init__(self,up_speed,down_speed):pygame.sprite.Sprite.__init__(self)self.up_speed = up_speedself.down_speed = down_speedself.image = ball_imageself.rect = self.image.get_rect()self.rect.top = 0self.rect.left =(width-self.image.get_width())//2def moveup(self):self.rect.top -=self.up_speeddef movedown(self):self.rect.top +=self.down_speedball = Ball(6,4)
clock = pygame.time.Clock()
while 1:for event in pygame.event.get():if event.type == QUIT:exit()key_press =pygame.key.get_pressed()if not key_press[K_UP] and ball.rect.bottom < height:ball.movedown()elif key_press[K_UP] and ball.rect.top>0:ball.moveup()screen.fill(bg)screen.blit(ball_image,ball.rect)clock.tick(25)pygame.display.flip()                      #将更新显示到屏幕上

所需图片

图片为png格式，当然，也可以选择其他图片作为游戏对象