Pygame basic class structure

pygame.py

import pygame
from pygame.locals import *


class Game(object):
	"""docstring for Game"""
	def __init__(self,arg):
		self.arg = arg
		self.fullscreen = False
		img = pygame.image.load('image.png')
		self.crosshair_image = pygame.transform.scale(img,(50,50))
		self.clk = pygame.time.Clock()
		self.x = width/2
		self.y = heigth/2
		self.fullscreen = False
		pygame.mouse.set_visible(False)

	def main(self, screen):
		"""Main Game Loop"""
		while True:
			self.clk.tick(24)
			x,y = pygame.mouse.get_pos()
			screen.fill((0,0,0))
			screen.blit(self.crosshair_image,(x-25,y-25))
			pygame.display.flip()

			for event in pygame.event.get():
				if event.type == QUIT:
					return
				elif event.type == KEYDOWN:
					if event.key == K_ESCAPE:
						return
					elif event.key == K_RETURN:
						self.fullscreen = pygame.display.toggle_fullscreen()
						print self.fullscreen
				elif event.type == VIDEORESIZE:
					width,heigth = event.dict['size']
					screen = pygame.display.set_mode((width,heigth),HWSURFACE|DOUBLEBUF|RESIZABLE)


if __name__ == '__main__':
	pygame.init()

	width = 800
	heigth = 600
	

	screen = pygame.display.set_mode((width, heigth),HWSURFACE|DOUBLEBUF|RESIZABLE)
	pygame.display.set_caption('Python Game')

	Game(0).main(screen)