pygame play the balls

import pygame
import sys
from pygame.locals import *
from random import *
import traceback

class Ball(pygame.sprite.Sprite):
    def __init__(self,grayball_image,greenball_image,positiion,speed,bg_size,target):
        pygame.sprite.Sprite.__init__(self)
        self.grayball_image=pygame.image.load(grayball_image).convert_alpha()
        self.greenball_image = pygame.image.load(greenball_image).convert_alpha()
        self.rect=self.grayball_image.get_rect()
        self.rect.left,self.rect.top=positiion
        self.speed=speed
        self.width,self.height=bg_size[0],bg_size[1]
        self.radius=self.rect.width/2
        self.target=target
        self.control=False
        self.side = [choice([-1, 1]), choice([-1, 1])]
        self.collide = False
    def move(self):
        if self.control:
            self.rect = self.rect.move(self.speed)
        else:
            self.rect = self.rect.move(self.side[0] * self.speed[0], self.side[1] * self.speed[1])
        if self.rect.right<=0:
            self.rect.left=self.width
        elif self.rect.left>=self.
            self.rect.right=0
        elif self.rect.bottom<=0:
            self.rect.top=self.height
        elif self.rect.top>=self.height:
            self.rect.bottom=0
    def check(self, motion):
        if self.target < motion < self.target +5 :
            return True
        else:
            return False
# 玻璃
class Glass(pygame.sprite.Sprite):
    def __init__(self, glass_image,mouse_image, bg_size):
        pygame.sprite.Sprite.__init__(self)
        self.glass_image = pygame.image.load(glass_image).convert_alpha()
        self.glass_rect = self.glass_image.get_rect()
        self.glass_rect.left, self.glass_rect.top = (bg_size[0]-self.glass_rect.width)//2,(bg_size[1]-self.glass_rect.height)
        self.mouse_image = pygame.image.load(mouse_image).convert_alpha()
        self.mouse_rect = self.mouse_image.get_rect()
        self.mouse_rect.left, self.mouse_rect.top =  self.glass_rect.left, self.glass_rect.top
        # 初始化鼠标的位置于左上角
        pygame.mouse.set_pos([ self.glass_rect.left, self.glass_rect.top])
        # 鼠标不可见
        pygame.mouse.set_visible(False)

def main():
    pygame.init()
    pygame.mixer.init()
    grayball_image="gray_ball.png"
    greenball_image="green_ball.png"
    bg_image="background.png"
    mouse_image="hand.png"
    glass_image = "glass.png"
    running=True
    # 添加背景音乐
    pygame.mixer.music.load("bg_music.ogg")
    pygame.mixer.music.play()
    # 添加音效
    loser_sound = pygame.mixer.Sound("loser.wav")
    laugh_sound = pygame.mixer.Sound("laugh.wav")
    winner_sound = pygame.mixer.Sound("winner.wav")
    hole_sound = pygame.mixer.Sound("hole.wav")
    # 音乐播放时结束
    GAMENOVER=USEREVENT
    # 音乐停止时向队列发送一个信号
    pygame.mixer.music.set_endevent(GAMENOVER)
    pygame.mixer.music.play()

    bg_size=width,height=1024,681
    screen=pygame.display.set_mode(bg_size)
    pygame.display.set_caption("球球")
    background=pygame.image.load(bg_image).convert_alpha()
    balls=[]
    hole=[(117,119,199,201),(225,227,390,392),(503,505,320,322),(698,700,192,194),(906,908,419,421)]
    group=pygame.sprite.Group()
    for i in range(5):
        position=randint(0,width-100),randint(0,height-100)
        speed=[randint(1,10),randint(1,10)]
        ball=Ball(grayball_image,greenball_image,position,speed,bg_size,5*(i+1))
        # 检测新的球是否会卡住其他的球
        while pygame.sprite.spritecollide(ball, group, False, pygame.sprite.collide_circle):
            ball.rect.left, ball.rect.top = randint(0, width - 100), randint(0, height - 100)
        balls.append(ball)
        group.add(ball)
    area=Glass(glass_image,mouse_image,bg_size)
    motion=0
    MYTIMER=USEREVENT+1
    pygame.time.set_timer(MYTIMER,1000)
    pygame.key.set_repeat(100,100)
    # 限制cpu使用
    clock=pygame.time.Clock()

    while running:
        for event in pygame.event.get():
            if event.type==QUIT:
                sys.exit()
            elif event.type==MYTIMER:
                if motion:
                    for each in  group:
                        if each.check(motion):
                            each.speed=[0,0]
                            each.control=True
                    motion=0
            elif event.type==MOUSEMOTION:
                motion+=1
            elif event.type ==GAMENOVER:
                loser_sound.play()
                pygame.time.delay(100000)
                laugh_sound.play()
                running=False
            elif event.type==KEYDOWN:
                if event.key==K_w:
                    for each in group:
                        if each.control:
                            each.speed[1]-=1
                if event.key == K_s:
                    for each in group:
                        if each.control:
                            each.speed[1] += 1
                if event.key == K_a:
                    for each in group:
                        if each.control:
                            each.speed[0] -= 1
                if event.key == K_d:
                    for each in group:
                        if each.control:
                            each.speed[0] += 1
                if event.key==K_SPACE:
                    if each.control:
                        for i in hole:
                            if i[0]<=each.rect.left<=i[1] and i[2]<=each.rect.top<=i[3]:
                                hole_sound.play()
                                each.speed[0,0]
                                group.remove(each)
                                temp=balls.pop((balls.index(each)))
                                balls.insert(0,temp)
                                hole.remove(i)
                            if not hole:
                                pygame.mixer.music.stop()
                                winner_sound.play()
                                pygame.time.delay(3000)
                                msg=pygame.image.load("win.png").convert_alpha()
                                msg_pos=(width-msg.get_width())//2,(height-msg.get_height())//2
                                msg.append(msg,msg_pos)
                                laugh_sound.play()

        screen.blit(background,(0,0))
        screen.blit(area.glass_image,area.glass_rect)
        # 获取鼠标当前位置，并设置代替光标的图标
        area.mouse_rect.left,area.mouse_rect.top=pygame.mouse.get_pos()
        # 限制鼠标只能在玻璃内摩擦
        if area.mouse_rect.left<area.glass_rect.left:
            area.mouse_rect.left=area.glass_rect.left
        if area.mouse_rect.right > area.glass_rect.right:
            area.mouse_rect.right = area.glass_rect.right
        if area.mouse_rect.top <area.glass_rect.top:
            area.mouse_rect.top = area.glass_rect.top
        if area.mouse_rect.bottom >area.glass_rect.bottom:
            area.mouse_rect.bottom = area.glass_rect.bottom

        screen.blit(area.mouse_image, area.mouse_rect)
        for each in balls:
            each.move()
            if each.collide:
                each.speed=[randint(1,10),randint(1,10)]
                each.collide=False
            if each.control:
                screen.blit(each.greenball_image,each.rect)
            else:
                screen.blit(each.grayball_image, each.rect)
        for each in group:
            group.remove(each)
            if pygame.sprite.spritecollide(each,group,False, pygame.sprite.collide_circle):
                each.side[0]=-each.side[0]
                each.side[1] = -each.side[1]
                each.collide=True
                if each.control:
                    each.side[0]=-1
                    each.side[-1]=-1
                    each.control=False
                # each.speed[0]=-each.speed[0]
                # each.speed[1] = -each.speed[1]
                # each.collide=False
                # each.control=False
            group.add(each)

        pygame.display.flip()
        clock.tick(30)
if __name__=="__main__":
    try:
        main()
    except SystemExit:
        pass
    except:
       traceback.print_exc()
    pygame.quit()
    input()
github完整代码与素材：https://github.com/cherrysink/theplaytheballs