PyGame Basics

class Game():
    def __init__(self):
        pygame.init() # initialise pygame libraries
        self.size = WIDTH, HEIGHT
        self.display = pygame.display.set_mode(self.size)
        self.disp_surf = self.init_display()
        self.running = True if self.disp_surf else False
        self.font = pygame.font.Font(pygame.font.get_default_font(), 36)
        self.ball = Ball()
        self.hand = Hand()
        self.allsprites = pygame.sprite.RenderPlain((self.ball, self.hand))
        self.sound_hit = pygame.mixer.Sound("thump.wav")
        self.sound_missed = pygame.mixer.Sound("swish.wav")

    def check_events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                self.running = False
            elif event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
                self.running = False
            elif event.type == pygame.MOUSEBUTTONDOWN:
                if self.hand.hit(self.ball):
                    self.ball.hit()
                    self.sound_hit.play()
                else:
                    self.sound_missed.play()
            elif event.type == pygame.MOUSEBUTTONUP:
                self.hand.unhit()
        return