Pygame Template With Player Classs

import pygame, math, random
pygame.init()
clock = pygame.time.Clock()
WIDTH = 800
HEIGHT = 600
screen = pygame.display.set_mode((WIDTH, HEIGHT))
run = True

playergroup = pygame.sprite.Group()

###################### CLASS PLAYER ######################
class Player(pygame.sprite.Sprite):
    def __init__(self,x,y):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load('dot16.png').convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

    def update(self):
        pass

###################### OBJECT CREATION ######################

player = Player(WIDTH/2,HEIGHT/2)
playergroup.add(player)

###################### MAIN LOOP ######################
while run:

    playergroup.update()

    screen.fill((255,255,255))

    playergroup.draw(screen)

    clock.tick(30)
    pygame.display.update()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
pygame.quit()